Rainbow
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B1 noun /ˈreɪn.boʊ/

Rainbow

Meaning
an arch of colors formed in the sky by sunlight shining through rain
Example
After the storm, a beautiful rainbow appeared in the sky.
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 verb /rɛnd/

rend

Meaning
to tear something apart violently or forcefully
Example
The explosion rent the air with a deafening noise.
B2 noun /rɪˈmuː.vəl/

Removal

Meaning
the action of taking something away or eliminating it; dismissal from office
Example
The removal of the old furniture took all day.
C2 adjective /raɪˈpɛə.ri.ən/

riparian

Meaning
Relating to or situated on the banks of a river or other watercourse.
Example
Riparian vegetation helps prevent soil erosion along rivers.
B2 verb /rɪˈvɜːs/

reverse

Meaning
to change something to the opposite direction, position, or result
Example
She quickly reversed the car out of the driveway.
C1 verb /ˈrʌsl/

rustle

Meaning
To make a soft, light sound like leaves or paper moving.
Example
The leaves rustled gently in the evening breeze.
A1 adjective /red/

Red

Meaning
having the color of blood or fire; of the color red
Example
She wore a beautiful red dress to the party.
C2 verb /ˌrɛprɪˈhɛnd/

reprehend

Meaning
to express disapproval or criticism of someone or something
Example
The teacher reprehended the student for being dishonest.
B2 noun /roʊˈteɪʃən/

Rotation

Meaning
the action of rotating around an axis or center; a single turn
Example
The Earth's rotation takes 24 hours to complete.
B1 preposition /rɪˈɡɑrdɪŋ/

regarding

Meaning
concerning or relating to
Example
The decision regarding the meeting will be made tomorrow.
B2 adverb /rɪˈɡɑrdləs/

regardless

Meaning
without paying attention to the current situation or condition
Example
She will go to the party regardless of the weather.
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.
B1 verb /rɪˈɡɑːrd/

regard

Meaning
to consider or think of in a particular way; to look at
Example
She regards him as her best friend.
B2 verb /rɪˈɡeɪn/

regain

Meaning
to get back something that was lost; to recover
Example
He regains his strength after the illness.
C1 noun rɪˈdʌndənsi

redundancy

Meaning
The state of being not or no longer needed or useful; superfluousness.
Example
The redundancy in the company's workforce led to many layoffs.
A2 noun, verb /raʊ/ (argument), /roʊ/ (line of things)

row

Meaning
A line of things or people; also, a noisy quarrel; to propel a boat with oars.
Example
They had a loud row about money.
B1 verb /ˌrɛprɪˈzɛnt/

represent

Meaning
to act or speak on behalf of someone or something
Example
He will represent our company at the conference.
C1 noun /rɪˈteɪnər/

retainer

Meaning
a fee paid in advance to secure someone's services, or a device that holds something in place
Example
The lawyer asked for a retainer before taking the case.
C1 adjective /rɪˈvɜː.sə.bəl/

Reversible

Meaning
able to be turned the other way around; able to be undone or changed back
Example
This jacket is reversible and can be worn on both sides.
C2 noun /rɪˈpoʊst/

riposte

Meaning
a quick and clever reply to criticism or an insult
Example
Her sharp riposte left everyone in silence.
B2 verb /ˌriːprəˈdjuːs/

reproduce

Meaning
To make a copy of something; to generate offspring.
Example
Many animals reproduce rapidly in favorable conditions.
B1 noun /rɪˈsɔːrs/

resource

Meaning
A supply of materials, money, or assets that can be used when needed.
Example
Water is a vital natural resource.
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 /rɪˈflɛktər/

reflector

Meaning
A surface or device that reflects light, heat, or sound, often used to direct beams or improve visibility.
Example
The cyclist attached a red reflector to the back of his bike for safety.
C2 noun /rɪˈɡætə/

regatta

Meaning
A sporting event consisting of a series of boat or yacht races.
Example
The annual regatta attracted competitors from around the world.
B2 noun /ˌrɪəlɪˈzeɪʃən/

realization

Meaning
the act of becoming fully aware of something as a fact
Example
Her realization of the problem helped solve the issue.
B2 verb /rɪp/

rip

Meaning
to tear something quickly or violently
Example
He accidentally ripped his shirt on the fence.
B1 noun /rɪˈpɔːtɪŋ/

reporting

Meaning
the act of giving news or information about something
Example
Good reporting is essential for public awareness.
A1 verb /rʌn/

run

Meaning
to move quickly on foot; to operate or function
Example
I run every morning for exercise.
B2 noun /rɪˈmeɪn.dər/

Remainder

Meaning
the part that is left over; what remains after the other parts have been taken away
Example
The remainder of the food was stored in the refrigerator.
C2 verb /raɪv/

rive

Meaning
to tear apart violently
Example
The earthquake rived the ground in several places.
B2 adjective /rɪˈnjuː.ə.bəl/

renewable

Meaning
Able to be renewed or replaced naturally; not depleted when used.
Example
Renewable resources minimize environmental damage.
C2 noun /ˈrɛkluːsəri/

reclusory

Meaning
A place for seclusion or retreat, especially for a recluse or hermit.
Example
The monk spent years in the reclusory away from society.
B2 noun /raɪˈnɒs.ər.əs/

Rhinoceros

Meaning
a large, heavy animal with thick skin and one or two horns on its nose
Example
The rhinoceros charged through the grassland.
B2 noun /ˈraɪfəl/

Rifle

Meaning
a gun with a long barrel that is fired from the shoulder
Example
The soldier carried a rifle during the mission.
C2 noun /rɪˈsɪdɪˌvɪzəm/

recidivism

Meaning
The tendency of a convicted criminal to reoffend or relapse into criminal behavior.
Example
The government introduced new programs to reduce recidivism among former inmates.
B2 noun rɪˈzɪl.i.əns

resilience

Meaning
The ability to recover quickly from difficulties; toughness.
Example
Testing the resilience of wood is crucial.
A1 noun /reɪn/

Rain

Meaning
water that falls from clouds in small drops
Example
The heavy rain forced us to stay indoors.
C2 adjective rɪˈtɛn.tɪv

retentive

Meaning
Having strong memory or the ability to retain information for a long time.
Example
Students with a retentive memory excel in academics.
C2 verb /rɛtʃ/

retch

Meaning
to make the sound and movement of vomiting without bringing anything up
Example
The smell of spoiled food made him retch violently.
C1 noun /raɪt/

rite

Meaning
a religious or ceremonial act
Example
The wedding rite was performed with great solemnity.
C1 noun /ˌræʃəˈnæl/

rationale

Meaning
the underlying reason or explanation for something
Example
The rationale behind his decision was clearly explained.
C1 noun /rɪˈsaɪtər/

reciter

Meaning
a person who recites or repeats something aloud from memory, especially poetry, prayers, or formal texts
Example
The reciter delivered the poem with clarity and emotion.
B2 noun /rɪm/

rim

Meaning
the outer edge or border of a circular object
Example
The coffee cup had a chip on its rim.
C1 noun ˈrɛp.ə.twɑːr

repertoire

Meaning
A stock of plays, dances, or pieces that a company or a performer knows or is prepared to perform.
Example
The actor's repertoire includes both comedy and drama.
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.
C2 noun /ˌrɛprɪˈhɛnʃən/

reprehension

Meaning
The act of rebuking or criticizing severely.
Example
The teacher’s reprehension of the student’s behavior was justified.
A2 adverb /ˈrɛɡjələrli/

regularly

Meaning
at regular intervals; in a regular manner
Example
She exercises regularly to stay healthy.
C1 noun /ˈriːbeɪt/

rebate

Meaning
a partial refund given to someone who has paid too much money for something
Example
The store offered a rebate on bulk purchases.
C1 verb /rɪˈsɪprəˌkeɪt/

reciprocate

Meaning
To respond to an action or gesture by making a corresponding one.
Example
She smiled at him, and he reciprocated with a warm hug.
A2 noun /ˈriː.zənz/

reasons

Meaning
Causes, explanations, or justifications for an action or event.
Example
Reasons for pollution need addressing urgently.
B2 verb /rɪˈstrɪkt/

restrict

Meaning
To limit the size, amount, or range of something.
Example
The government decided to restrict the use of plastic bags.
B1 noun /ˌrɛp.jʊˈteɪ.ʃən/

reputation

Meaning
The opinion generally held about someone or something; fame or prestige.
Example
A good reputation is essential for business success.
C2 adjective /rɪˈfʌldʒənt/

refulgent

Meaning
Shining brightly; radiant.
Example
The refulgent sun lit up the entire valley.
C2 noun, adjective, verb /ˈrɛprəˌbeɪt/

reprobate

Meaning
A person of immoral character; to express disapproval of; morally corrupt.
Example
The old reprobate spent his days gambling and drinking.
B2 adjective ˈræd.ɪ.kəl

radical

Meaning
Capable of bringing fundamental changes opposite to conventional beliefs or systems.
Example
The leader proposed radical economic reforms.
C2 adjective /ræpˈtɔːriəl/

raptorial

Meaning
Relating to birds of prey or predatory behavior.
Example
The eagle is a raptorial bird with sharp talons.
B1 adjective /rɪˈkwaɪəd/

required

Meaning
necessary or compulsory
Example
A visa is required to enter the country.
B2 verb /rɪˈzɜːv/

reserve

Meaning
to keep something for future use; to book in advance
Example
I want to reserve a table for dinner.
B1 noun /rɪˈkɔːdɪŋ/

recording

Meaning
the act or process of recording something
Example
The recording of the interview was clear and loud.
A2 verb /rɪˈmuːv/

remove

Meaning
to take something away; to eliminate or delete
Example
Please remove your shoes before entering the house.
B1 noun rɪˈflɛkʃən

reflection

Meaning
Serious thought or consideration about something.
Example
The reflection of the past filled his heart with sadness.
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.
C1 noun /rɪˈpen.təns/

Repentance

Meaning
the action of repenting; sincere regret or remorse
Example
His genuine repentance moved everyone in the courtroom.
B2 adjective /ˈrʌn daʊn/

run-down

Meaning
in a poor condition; worn out or neglected
Example
They live in a run-down house at the edge of town.
C1 adjective /rɪˈmoʊtɪd/

remoted

Meaning
placed at a distance; made remote
Example
The system was remoted to a secure location.
C1 verb /raʊz/

rouse

Meaning
To awaken from sleep or to stir into action.
Example
The loud alarm roused him from his deep sleep.
C1 noun /ˌrɛfjʊˈteɪʃən/

refutation

Meaning
The act of proving a statement or argument to be false or incorrect.
Example
Her essay was a strong refutation of the opposing theory.
B1 adjective rɪˈlaɪ.ə.bəl

reliable

Meaning
Consistently good in quality or performance; able to be trusted.
Example
Reliable systems ensure efficiency.
A2 verb /rɪŋ/

ring

Meaning
to make a clear sound like a bell; to call by telephone
Example
The bell rings every hour.
A2 verb /reɪz/

raise

Meaning
To lift or move something to a higher position; to increase; to bring up.
Example
She raised her hand to ask a question.
A2 noun /ˈreɪl.weɪ/

Railway

Meaning
a track made of steel rails along which trains run; a system of tracks with trains, stations, and other facilities
Example
The railway connects major cities across the country.
C2 noun /rɪˈfɛkʃən/

refection

Meaning
a meal or the act of taking food and drink
Example
The monks gathered for their evening refection.
B2 adjective rɪˈnaʊnd

renowned

Meaning
Known or talked about by many people; famous.
Example
The renowned scientist led the reform panel.
C1 verb /ˈrɛlɪɡeɪt/

relegate

Meaning
to assign to a lower rank, position, or category
Example
The manager decided to relegate the player to the bench.
C1 noun /ræˈpɔːr/

rapport

Meaning
A close and harmonious relationship in which the people or groups concerned understand each other's feelings or ideas.
Example
The teacher built a strong rapport with her students.
B1 noun /ˈriː.dʒən/

Region

Meaning
a particular area or part of a country or the world
Example
This region is famous for its wine production.
B2 noun /ˈraɪdər/

rider

Meaning
A person who rides a horse, bicycle, motorcycle, or other vehicle.
Example
The rider fell off the horse.
C1 noun /ˈrɛɡjəleɪtər/

regulator

Meaning
a person or device that controls or maintains the operation of a system
Example
The government appointed a new regulator for the financial sector.
B1 noun ruːlz ənd ˌrɛɡjʊˈleɪʃənz

rules and regulations

Meaning
Official orders and laws that control how something is done.
Example
Rules and regulations alone cannot change attitudes.
C2 noun /roʊˈtʌn.də/

rotunda

Meaning
a large circular building or hall, often with a dome
Example
Tourists gathered inside the grand rotunda of the capitol.
C1 adjective /ˈraɪ.tʃəs/

Righteous

Meaning
morally right or justifiable; virtuous; having strong moral principles
Example
She felt righteous anger at the unfair treatment of workers.
B2 noun rɪˈkruːt.mənt

recruitment

Meaning
The action of finding new people to join an organization or support a cause.
Example
Recruitment strengthens the workforce.
C2 noun /ˈrɛdʒɪsaɪd/

regicide

Meaning
the act of killing a king
Example
The conspirators were executed for committing regicide.
C1 adjective /ˈrʌɡ.ɪd/

Rugged

Meaning
rough and uneven; having a rough irregular surface; tough and strong
Example
The hikers crossed the rugged mountain terrain.
C1 noun /rɪˈpɔːrtɪʒ/

reportage

Meaning
the act of reporting news or describing events in the media
Example
The magazine is known for its detailed reportage of political issues.
B1 noun rɪˌspɒnsəˈbɪlɪti

responsibility

Meaning
The state or fact of having a duty to deal with something or of having control over someone.
Example
Taking responsibility for one's actions is a sign of maturity.
A2 noun /ˈriːdɪŋ/

reading

Meaning
the action or skill of reading
Example
Reading is one of my favorite hobbies.
A1 noun /ruːm/

room

Meaning
A space within a building enclosed by walls, floor, and ceiling
Example
She decorated her room with bright colors.
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.
C1 adjective /rɪˈtæl.i.ə.tɔːr.i/

retaliatory

Meaning
Taking action in response to another's action, characterized as punitive, revengeful, or counteractive.
Example
The country imposed retaliatory tariffs in response to trade sanctions.
B2 noun ˌrɛzɪɡˈneɪʃən

resignation

Meaning
The acceptance of something undesirable but inevitable; giving up.
Example
Her resignation from the position was unexpected.
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.
C2 noun /roʊˈtʌn.də.ti/

rotundity

Meaning
the quality of being round or plump
Example
The rotundity of the balloon made it float gracefully.
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.
B1 noun /rɪˈsɜːtʃə(r)/

researcher

Meaning
a person who conducts research
Example
The researcher published her findings in a scientific journal.
A2 verb /rɪˈtɜːrn/

return

Meaning
to come or go back to a place; to give back
Example
I will return home tomorrow.
C1 adjective /rɪˈbel.jəs/

Rebellious

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

revenue

Meaning
Income, especially when of a company or organization.
Example
The company's revenue grew by 10% this year.
C1 verb /rɪˈdʒɛnəreɪt/

regenerate

Meaning
to grow or produce again; to renew or restore
Example
The lizard can regenerate its lost tail.
A1 adverb /ˈriː.ə.li/

Really

Meaning
actually; truly; very much
Example
I really enjoyed the concert last night.
C2 verb (archaic/rare) /rɛk/

reck

Meaning
To care about or be concerned with (something); to have regard for.
Example
He does not reck the dangers of his actions.
C1 verb /rænt/

rant

Meaning
to speak or shout in an angry, uncontrolled way
Example
He ranted about the unfair treatment at work.
B2 noun /ˈrɒbər/

robber

Meaning
a person who steals property from others, often using force or threat
Example
The robber was caught after a quick police chase.
C1 verb /ˈrek.ən.saɪl/

reconcile

Meaning
Restore friendly relations between; cause to coexist in harmony.
Example
They tried to reconcile their differences through open communication.
C2 adjective /ˈrʌdi/

ruddy

Meaning
Having a healthy red color in the face.
Example
She had a ruddy complexion from working outdoors.
C1 noun /rɪˈvɜːrʒən/

reversion

Meaning
the act of returning to a previous state or condition
Example
The new policy marked a reversion to traditional methods.
B1 verb rɪˈdjuːst

reduced

Meaning
Make smaller or less in amount, degree, or size.
Example
Singapore has reduced plastic usage significantly.
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 adjective /roʊˈtʌnd/

rotund

Meaning
round or plump in shape; full in sound
Example
The rotund cat struggled to climb the fence.
B2 noun /reɪk/

Rake

Meaning
a garden tool with a long handle and prongs for gathering leaves; to gather with a rake
Example
He used a rake to gather the fallen autumn leaves.
C1 verb /ˈræn.sæk/

ransack

Meaning
to search a place roughly and steal or damage things
Example
Burglars ransacked the house while the family was away.
B2 verb /ˈrʌm.bəl/

rumble

Meaning
to make a continuous deep, resonant sound
Example
Thunder rumbled in the distance.
C1 noun /rɪˈpjuːt/

repute

Meaning
the opinion generally held of someone or something; reputation
Example
He is a scholar of great repute in his field.
C1 adjective rɪsk-ədˈʤɛstɪd

risk-adjusted

Meaning
Modified or calibrated to account for risk factors in investment returns.
Example
Risk-adjusted returns consider both potential profit and loss.
B2 adjective /rɪˈspek.tə.bəl/

Respectable

Meaning
worthy of respect; having good reputation; decent
Example
He comes from a respectable family in the community.
A2 verb /rɪˈdjuːs/

reduce

Meaning
to make smaller in size, amount, or degree; to decrease
Example
We need to reduce our expenses this month.
B2 noun ˌriːfɔːˈreɪʃən

reforestation

Meaning
The natural or intentional restocking of existing forests and woodlands that have been depleted.
Example
Reforestation efforts are crucial to restoring ecosystems.
C1 adjective /ˈrek.wɪ.zɪt/

Requisite

Meaning
made necessary by particular circumstances; required
Example
Good communication skills are requisite for this job.
B2 noun /ˈrɛzərvwɑːr/

reservoir

Meaning
A large natural or artificial lake used as a source of water supply.
Example
The city built a new reservoir to ensure enough drinking water for its residents.