roil
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C2 verb /rɔɪl/

roil

Meaning
to make a liquid muddy or disturbed; to cause agitation or disorder
Example
The constant protests roiled the city streets.
C2 noun /ˈrʊkəri/

rookery

Meaning
a place where rooks or other birds breed and nest in colonies
Example
We saw a rookery full of noisy birds near the forest.
C1 verb /rɪˈvoʊk/

revoke

Meaning
To officially cancel or withdraw a decision, privilege, or right.
Example
The government decided to revoke his passport.
B2 noun /ˈreɪ.zən/

Raisin

Meaning
dried grape
Example
She added raisins to the oatmeal cookies for extra sweetness.
B2 verb /ˈraɪpən/

ripen

Meaning
to become or make something ready to eat or fully developed
Example
The bananas ripened quickly in the warm weather.
B2 noun /ˈreɪn.dʒər/

ranger

Meaning
A person responsible for protecting and managing forests, parks, or natural areas.
Example
The park ranger guided the tourists through the forest trail.
C2 noun /ˈrɪɡməˌroʊl/

rigmarole

Meaning
a long, complicated, and confusing process or story
Example
Getting a visa was such a rigmarole of paperwork and interviews.
C1 noun /ˈroʊdənt/

rodent

Meaning
a small mammal such as a mouse, rat, or squirrel, characterized by constantly growing incisors
Example
The farmer set traps to catch the rodents in his barn.
B2 noun /ˈrem.ə.di/

Remedy

Meaning
a medicine or treatment for a disease; a solution to a problem
Example
This herbal remedy helps with headaches.
B2 noun ˌrɛvəˈluːʃən

revolution

Meaning
A forcible overthrow of a government or social order, in favor of a new system.
Example
The story is set during the French Revolution.
B2 noun /ˈroʊstɪd miːt/

Roasted meat

Meaning
meat cooked by dry heat in an oven or over fire
Example
The roasted meat was perfectly seasoned and tender.
C2 adjective /ˈrɛstɪv/

restive

Meaning
unable to stay still or silent; restless and impatient
Example
The crowd grew restive as they waited for the concert to begin.
C1 verb /rɪˈpiːl/

repeal

Meaning
To officially cancel or revoke a law or decision.
Example
The government decided to repeal the outdated law.
C2 adjective /ˈrɛd.ələnt/

redolent

Meaning
having a strong pleasant smell; strongly reminiscent or suggestive of something
Example
The kitchen was redolent of spices and fresh herbs.
C1 noun /ˈriːkɔːrs/

recourse

Meaning
a source of help or protection in a difficult situation
Example
The students had no recourse but to appeal to the principal.
C2 noun /red ˌəʊ.liˈæn.dər/

Red oleander

Meaning
a poisonous flowering shrub with bright red or pink flowers
Example
The red oleander blooms throughout the summer months.
C2 noun /ˌriːkruːˈdɛsəns/

recrudescence

Meaning
a new outbreak or revival of something that had subsided, especially an undesirable condition
Example
Health officials warned of a recrudescence of measles in several districts.
B1 noun riˈækʃən

reaction

Meaning
An action performed or a feeling experienced in response to a situation or event.
Example
The arrests triggered a reaction.
A1 noun, adjective, adverb /raɪt/

right

Meaning
something that is morally good, fair, or just; or a legal/entitled claim
Example
Everyone has the right to free speech.
B2 verb /rɪˈtriːv/

retrieve

Meaning
to get something back that was lost or taken; to recover
Example
She managed to retrieve her lost phone from the taxi.
B1 noun ˌrekəɡˈnɪʃn

recognition

Meaning
Acknowledgment of the existence, validity, or legality of something; appreciation or acclaim for an achievement, service, or ability.
Example
He earned recognition after years of struggle.
B2 adjective /ˈrɪdʒ.ɪd/

Rigid

Meaning
hard and stiff; not able to bend; strict and unwilling to change
Example
The company has a rigid dress code that all employees must follow.
C2 noun /ˈræbəl/

Rabble

Meaning
a disorderly crowd; the common people regarded as socially inferior
Example
The politician dismissed the protesters as mere rabble.
B2 adjective /rɪˈstrɪk.tɪd/

Restricted

Meaning
limited or controlled; subject to restrictions
Example
Access to this area is restricted to authorized personnel only.
B1 noun /ˈrʌnər/

runner

Meaning
a person who runs, especially in races or for exercise
Example
The runner crossed the finish line with a big smile.
B2 noun ˌreɪdɪˈeɪʃən

radiation

Meaning
The emission of energy as electromagnetic waves or as moving subatomic particles.
Example
Radiation from the sun can be harmful without protection.
C1 adjective /rɪˈsɛptɪv/

receptive

Meaning
Willing to listen to or accept new ideas, suggestions, or experiences.
Example
She was receptive to feedback from her colleagues.
C2 noun /rɪˈfɛktəri/

refectory

Meaning
a dining hall, especially in a monastery, convent, or school
Example
Students had lunch in the refectory.
A2 noun /roʊz/

Rose

Meaning
a fragrant flower with thorny stems, typically red, pink, white, or yellow
Example
She gave me a beautiful red rose for Valentine's Day.
B2 noun ˌriːkənˈstrʌkʃn

reconstruction

Meaning
The action or process of reconstructing or being reconstructed.
Example
The reconstruction project took years.
C1 adjective /rɪˈtɜː.nə.bəl/

Returnable

Meaning
able to be returned or given back
Example
The bottle is returnable for a deposit refund.
C1 noun /rɪˌmjuː.nəˈreɪ.ʃən/

Remuneration

Meaning
money paid for work or services; compensation or reward
Example
The job offers excellent remuneration and benefits.
C2 noun /ˈreɪləri/

raillery

Meaning
good-humored teasing or joking
Example
Their friendship was full of light-hearted raillery.
B2 noun /ˈruːlɪŋ/

ruling

Meaning
an official decision made by a judge or authority.
Example
The court’s ruling favored the defendant.
C1 verb /ˈræn.də.maɪz/

randomize

Meaning
To make something happen in a random order or manner.
Example
The software can randomize the order of questions.
B2 noun /ˈraɪət/

Riot

Meaning
a violent disturbance of the peace by a crowd; an uncontrolled outburst
Example
The peaceful protest turned into a riot when violence broke out.
A2 noun /reɪs/

race

Meaning
a competition of speed, or a group of people with similar characteristics
Example
The race was very exciting, with many competitors.
C1 noun /rʌsk/

Rusk

Meaning
a hard, dry biscuit or twice-baked bread; a type of crisp, sweet biscuit
Example
The baby enjoyed eating the soft rusk with milk.
C1 verb /rɪˈtɔːrt/

retort

Meaning
To reply quickly or sharply, often in a witty or angry manner.
Example
He quickly retorted that he was not to blame.
A2 verb /ˌrɛkəˈmɛnd/

recommend

Meaning
to suggest or advise something as being good or suitable
Example
I recommend trying the new restaurant downtown.
B2 noun /rɪˈsɪp.i.ənt/

Recipient

Meaning
a person who receives something
Example
She was the recipient of the prestigious award.
C1 verb /ˌriːˈmɒdəl/

remodel

Meaning
To change the structure or form of something, especially a building.
Example
They decided to remodel their kitchen last summer.
C2 verb /rɪˈɡeɪl/

regale

Meaning
To entertain or amuse someone with stories, food, or drink.
Example
He regaled us with stories of his travels around the world.
C1 verb /ˈrɪdɪkjuːl/

ridicule

Meaning
To make fun of someone or something in a cruel or dismissive way.
Example
He was ridiculed for his strange ideas.
A2 noun /rent/

Rent

Meaning
a payment made periodically by a tenant to a landlord for use of property
Example
The monthly rent for this apartment is quite affordable.
B1 noun /rɪˈtaɪə.mənt/

Retirement

Meaning
the action or fact of leaving one's job and ceasing to work; the period of life after leaving work
Example
He is planning his retirement after 40 years of service.
B2 verb /rɪˈstreɪn/

restrain

Meaning
to hold back or control; to limit or restrict
Example
Please restrain your dog.
B2 noun /ˈruːmər/

Rumour

Meaning
a currently circulating story or report of uncertain or doubtful truth; gossip
Example
There's a rumour that the company will close next month.
C1 noun/verb /rɪˈproʊtʃ/

reproach

Meaning
An expression of disapproval or disappointment; to criticize someone for doing wrong.
Example
She reproached him for arriving late to the meeting.
B2 verb /rɪˈtriːt/

retreat

Meaning
to move back or withdraw from a position or situation
Example
The soldiers had to retreat after losing the battle.
C1 adjective /rɪˈbel.jəs/

Rebellious

Meaning
defying authority; resisting control; disobedient;
Example
The rebellious teenager refused to follow his parents' rules.
B2 verb /rɪˈfreɪn/

refrain

Meaning
To hold oneself back from doing something.
Example
Please refrain from smoking in this area.
B2 verb /ˈrɛnəˌveɪt/

renovate

Meaning
to restore something old to a good state or to improve it
Example
They decided to renovate the old house before moving in.
C1 noun /ˌrɛpəˈreɪʃən/

reparation

Meaning
the making of amends for a wrong done by paying money or helping those who were wronged
Example
The government offered reparations to the victims of the conflict.
C2 adjective /rɪˈkʌmbənt/

recumbent

Meaning
lying down or in a resting position
Example
He was found recumbent on the sofa after a long day.
B2 noun /rɪˈdʒɛkʃən/

rejection

Meaning
the action of refusing or dismissing something or someone
Example
Her rejection of the offer surprised everyone.
C2 adjective /ˈreə.rɪ.faɪd/

rarefied

Meaning
Of high moral, intellectual, or cultural value; distant from ordinary life.
Example
He works in the rarefied world of classical music.
C2 verb /ˈrævəl/

ravel

Meaning
to tangle or complicate; to untangle or unravel depending on context
Example
She began to ravel the loose threads of the sweater.
A2 noun rɪˈspɛkt

respect

Meaning
A feeling of deep admiration for someone or something.
Example
We should show respect to the freedom fighters.
B2 verb /rɪˈsaɪt/

recite

Meaning
To say aloud something learned, especially poetry or text, from memory.
Example
The child recited a poem in front of the class.
C2 noun /ræpˈskæliən/

rapscallion

Meaning
A mischievous or cheeky person; a rascal.
Example
The little rapscallion hid his brother’s shoes as a prank.
C1 verb /riːl/

reel

Meaning
to lose balance and stagger; to wind or spin something onto a reel
Example
He reeled backward after being punched.
B2 adjective /rɪˈzɜːrvd/

Reserved

Meaning
slow to reveal emotion or opinions; restrained in manner
Example
She is quite reserved and doesn't talk much in meetings.
C1 noun /ˈrɛtɪsəns/

reticence

Meaning
the quality of being reserved or unwilling to speak freely
Example
His reticence made it difficult to know what he was thinking.
A2 adjective /rɪˈspɒn.sə.bəl/

Responsible

Meaning
accountable; having duties; reliable and trustworthy
Example
Parents are responsible for their children's education and well-being.
B2 adjective rəʊˈbʌst

robust

Meaning
Strong and healthy; vigorous; able to withstand or overcome adverse conditions.
Example
The robust infrastructure ensures reliable communication.
B1 noun /roʊˈmæns/

Romance

Meaning
a feeling of excitement and mystery associated with love; a love affair or relationship
Example
Their romance began when they met at the university library.
C1 noun /rɪˈmɪʃən/

remission

Meaning
A temporary or permanent decrease or disappearance of disease symptoms; forgiveness of sins or debts.
Example
The patient’s cancer is in remission after the treatment.
C2 noun /ˈrɛv.ər.i/

reverie

Meaning
A state of being pleasantly lost in one's thoughts; a daydream.
Example
Lost in reverie, he didn't hear his name being called.
C2 adjective /rəˈʃɛrʃ/

recherche

Meaning
Rare, exotic, or obscure, often in a sophisticated or refined way.
Example
The gallery displayed many recherche artworks from unknown artists.
A2 noun rɪˈpɔːt

report

Meaning
An account given of a particular matter, especially in the form of an official document after thorough investigation or consideration.
Example
The report highlights critical issues.
C1 verb /raɪl/

rile

Meaning
to irritate or annoy someone
Example
His careless comments really riled her.
C2 noun /ˈreɪdɪks/

radix

Meaning
the base or root of something; the number on which a system of numeration is built
Example
In mathematics, the decimal system has a radix of ten.
C2 adjective /ˈræŋ.kər.əs/

rancorous

Meaning
Characterized by bitterness or resentment.
Example
Their rancorous debate lasted for hours.
B2 adverb /rɪˈspektɪvli/

Respectively

Meaning
in the order given; separately and in the order already mentioned
Example
John and Mary are 25 and 30 years old respectively.
C1 noun /ˈrʌmpəs/

Rumpus

Meaning
a noisy disturbance; an uproar or commotion
Example
The children caused quite a rumpus in the playground.
C1 noun /rəʊˈbɒt.ɪk ˈsɜː.dʒər.i/

robotic surgery

Meaning
Surgery performed with the assistance of robotic systems to enhance precision and reduce invasiveness.
Example
Robotic surgery enhances precision in complex procedures.
A2 verb /rɪˈpiːt/

repeat

Meaning
to say or do something again
Example
Could you please repeat what you just said?
C1 noun /raɪt/

rite

Meaning
a religious or ceremonial act
Example
The wedding rite was performed with great solemnity.
C2 verb /ˈrʌmpəl/

rumple

Meaning
to make something untidy or wrinkled by creasing or crumpling
Example
She accidentally rumpled her dress while packing.
B2 noun rɪsk ˈfæktər

risk factor

Meaning
Something that increases the likelihood of developing a disease or condition
Example
Water pollution is a significant risk factor for health.
C1 verb /rɪˈsʌsɪteɪt/

resuscitate

Meaning
to revive someone from unconsciousness or apparent death
Example
The doctors tried to resuscitate the patient after the heart attack.
B1 verb /ˌrɛprɪˈzɛnt/

represent

Meaning
to act or speak on behalf of someone or something
Example
He will represent our company at the conference.
B1 noun /raɪs ˈkʊkər/

Rice cooker

Meaning
an electric appliance designed to cook rice automatically
Example
The rice cooker automatically switches off when the rice is perfectly cooked.
C2 noun/adjective /rɪˈmɒnstrənt/

remonstrant

Meaning
A person who makes a forceful protest (noun); protesting or objecting (adjective).
Example
He was a remonstrant voice in the assembly.
B1 noun ˌrek.ə.menˈdeɪ.ʃənz

recommendations

Meaning
Suggestions or proposals as to the best course of action.
Example
The commission submitted their recommendations.
B2 noun /ˈrɛlɪvəns/

relevance

Meaning
the quality or state of being closely connected or appropriate
Example
The relevance of the information was clear to everyone.
C1 verb /rænt/

rant

Meaning
to speak or shout in an angry, uncontrolled way
Example
He ranted about the unfair treatment at work.
C1 adjective /ˌrɛprɪˈhɛnsəbl̩/

reprehensible

Meaning
Deserving strong criticism or blame.
Example
His dishonest actions were truly reprehensible.
C2 adjective /ˈrɛkənˌdaɪt/ or /ˈrɛkəndaɪt/

recondite

Meaning
Little known or difficult to understand.
Example
The professor’s lecture was full of recondite theories.
B2 noun /ræk/

Rack

Meaning
a framework or structure for holding or storing things
Example
She hung her coat on the rack by the door.
A2 noun rɪˈsɜːtʃ

research

Meaning
The systematic investigation into and study of materials and sources in order to establish facts and reach new conclusions.
Example
Research on radio waves began earlier in India.
A1 verb /raɪd/

ride

Meaning
to travel on or in a vehicle; to sit on and control a horse
Example
She likes to ride her bicycle to work.
C2 adjective /rɪˈflɛktɪbəl/

reflectible

Meaning
capable of being reflected, as light or an image
Example
The surface of the lake is highly reflectible in the morning sun.
C2 adjective /rɪˈsplɛndənt/

resplendent

Meaning
Shining brilliantly; dazzling in appearance or effect
Example
The bride looked resplendent in her wedding gown.
A2 noun /rɪˈzʌlt/

result

Meaning
a consequence, effect, or outcome of something
Example
The result of the test was excellent.
C1 noun /rɪˈbʌtəl/

rebuttal

Meaning
a statement or argument made to oppose or disprove another
Example
Her rebuttal was clear and convincing.
C1 noun /ˈrəʊ.bɒt əˈsɪs.tɪd prəˈsiː.dʒərz/

robot-assisted procedures

Meaning
Medical operations performed with the help of robotic systems to enhance precision and control.
Example
Robot-assisted procedures reduce human error.
C1 noun /rɪˈdʒɪdəti/

Rigidity

Meaning
inability to bend or be forced out of shape; unwillingness to change or compromise
Example
The rigidity of the old system prevented any innovation.
C2 adjective /roʊn/

roan

Meaning
denoting an animal, especially a horse, having a coat of mixed colors, typically reddish-brown and white
Example
The rider mounted a roan horse with a speckled coat.
A2 noun /rɪˈlɪdʒ.ən/

religion

Meaning
a system of faith and worship involving belief in a higher power
Example
Freedom of religion is a fundamental human right.
C1 adjective rɪˈsɛʃ.ən.er.i

recessionary

Meaning
Relating to or characterized by economic recession.
Example
Governments introduce policies to counter recessionary effects.
C1 noun /roʊz ˈber.i/

Rose berry

Meaning
a type of berry with rose-like characteristics or flavor
Example
The rose berry has a delicate floral taste that reminds me of roses.
A2 noun /ˈriːdɪŋ/

reading

Meaning
the action or skill of reading
Example
Reading is one of my favorite hobbies.
C1 verb /ˌriːɪnˈsteɪt/

reinstate

Meaning
To restore someone or something to their former position or condition.
Example
The company decided to reinstate the suspended employee.
C2 noun /ˈriːbəs/

rebus

Meaning
a puzzle in which words are represented by pictures, symbols, or letters
Example
The children enjoyed solving the rebus puzzles in the magazine.
C1 noun/verb /rɪˈlæps/

relapse

Meaning
to return to a worse condition, especially after improvement; a deterioration after recovery
Example
After months of progress, he suffered a relapse.
C1 adjective /ˈrez.ə.luːt/

Resolute

Meaning
determined; having a firm decision; unwavering
Example
She remained resolute in her decision to pursue her dreams.
B2 verb /rɪˈvɜːrt/

revert

Meaning
to return to a previous state, condition, or practice
Example
The system will revert to its original settings after the update.
B2 noun /ˈrerəti/

Rarity

Meaning
the state of being rare; something that is uncommon or scarce
Example
The antique vase was a rarity worth thousands of dollars.
B2 noun, verb /ræŋks/

ranks

Meaning
Positions within a group, especially in a hierarchy or organization.
Example
He quickly moved up the ranks of the army.
A2 noun /rɒk/

rock

Meaning
a large, solid piece of mineral matter
Example
The mountain was made of solid rock.
C1 verb /ˌriːˈvæmp/

revamp

Meaning
To give a new and improved form, structure, or appearance to something.
Example
The company decided to revamp its website for a modern look.
C1 noun /roʊt/

rote

Meaning
mechanical or habitual repetition, often without understanding
Example
He learned the poem by rote without understanding its meaning.
C1 verb /ˌriːəˈdʒʌst/

readjust

Meaning
To change or move something again in order to achieve a better fit, condition, or balance.
Example
He readjusted the chair to make it more comfortable.
B2 noun /ˈræŋkɪŋ/

ranking

Meaning
a position in a list or hierarchy, especially in terms of performance or importance
Example
His ranking in the competition improved after each round.
B1 noun /roʊp/

rope

Meaning
a strong, thick cord made of twisted fibers or strands
Example
The climbers used a rope to scale the mountain.
B2 noun /ˌriː.ɪnˈfɔːrs.mənt/

reinforcement

Meaning
Strengthening or supporting something, especially behavior or learning.
Example
Positive reinforcement helps in learning.
B2 noun /ˈreɪ.dɑːr/

Radar

Meaning
a system for detecting the presence, direction, distance of aircraft, ships by sending out radio waves
Example
The radar detected an unknown aircraft approaching the base.
A2 preposition /riː/

re

Meaning
concerning or about (used in formal letters or emails)
Example
The letter was sent re your recent application.
C2 verb /ˌriː.kəˈnɔɪ.tər/

reconnoiter

Meaning
to make a preliminary inspection or survey, especially of an area for military or strategic purposes
Example
The soldiers reconnoitered the area before advancing.