space exploration
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B2 noun speɪs ɪksplɔːˈreɪʃən

space exploration

Meaning
The investigation of outer space by means of manned and unmanned spacecraft.
Example
Space exploration has expanded our knowledge of the universe.
C1 adjective /ˈsɒnɪk/

sonic

Meaning
Relating to or involving sound waves or speed of sound.
Example
The jet created a loud boom when it broke the sonic barrier.
B2 adjective /ˈstʌf.i/

Stuffy

Meaning
lacking fresh air; poorly ventilated; formal and conservative in attitude
Example
The room was stuffy and needed fresh air.
C1 verb /ˈsʌkɪŋ/

sucking

Meaning
Drawing in a liquid, air, or other substance through the mouth or a tube by creating a vacuum; also used figuratively for something unpleasant or ineffective
Example
The baby is sucking on a pacifier.
B2 noun /ˈsəʊ.ʃəl.ɪ.zəm/

socialism

Meaning
An economic system where the means of production are owned by the state or community.
Example
In socialism, resources are distributed equally among citizens.
A2 adjective /ˈsɪmələr/

Similar

Meaning
alike; having characteristics in common
Example
The two sisters have similar interests in music.
C1 adjective ˈsek.tər spəˈsɪf.ɪk

sector-specific

Meaning
Relating to or designed for a particular sector or industry.
Example
Sector-specific policies attract targeted investments.
B2 noun /ˈsɪmptəm/

symptom

Meaning
a sign or indication of something, especially of an illness
Example
Fever is a common symptom of the flu.
C2 adjective /ˌsɪkəˈfæntɪk/

sycophantic

Meaning
Behaving in a way that is excessively obedient or servile to gain favor.
Example
His sycophantic behavior annoyed his colleagues.
C1 noun /ˈspiːʃiː/

specie

Meaning
money in the form of coins rather than notes or credit
Example
The transaction was made in specie.
B2 verb /ˈsteɪ.bə.laɪz/

stabilize

Meaning
to make something steady, secure, or unlikely to change suddenly
Example
The government took measures to stabilize the economy.
C2 noun /ˌsuː.pɚˈfluː.ə.t̬i/

superfluity

Meaning
An excessive amount of something; more than what is needed.
Example
The room was filled with a superfluity of decorations.
C2 adjective /səˈlɪsɪtəs/

solicitous

Meaning
showing concern or care for someone's health, happiness, or comfort
Example
She was always solicitous about the well-being of her students.
B1 noun /ˈsɛkrəteri/

secretary

Meaning
a person employed to handle correspondence and manage routine tasks for an individual or organization
Example
The secretary scheduled the meeting for tomorrow.
C1 verb /ˈskævɪndʒ/

scavenge

Meaning
to search through waste or discarded material to find useful items
Example
The children scavenged for food in the garbage dump.
C1 adjective /ˈskræpi/

scrappy

Meaning
Determined and willing to fight or argue; also messy or disorganized.
Example
Despite being small, he was a scrappy fighter.
C1 noun /ˈskep.tɪ.sɪ.zəm/

skepticism

Meaning
A skeptical attitude; doubt as to the truth of something.
Example
His skepticism about new technology often makes him resistant to change.
C1 adjective /ˈstæɡ.nənt/

Stagnant

Meaning
not moving or flowing; showing no activity or development
Example
The stagnant water in the pond was covered with algae.
B2 noun /ˈspɛʃəlti/

specialty

Meaning
a particular area of study, work, or interest; something in which a person or place excels
Example
Her specialty is pediatric medicine.
B2 noun /stɑːˈveɪ.ʃən/

Starvation

Meaning
suffering or death caused by lack of food; extreme hunger
Example
Many people died of starvation during the famine.
C2 noun /ˈsɪʒ.ən/

scission

Meaning
the act of cutting or dividing something
Example
The political party suffered a scission over ideological disputes.
B1 adverb /ˈspeʃ.əl.i/

Specially

Meaning
for a particular purpose; especially; specifically
Example
This gift was specially made for you.
C1 adjective /ˈsʌn.dri/

sundry

Meaning
Various or miscellaneous.
Example
The shop sells fruits, clothes, and sundry items.
C2 noun /spliːn/

spleen

Meaning
an organ in the body that produces lymphocytes and filters blood; also refers to bad temper or spite
Example
He vented his spleen on his coworkers after the meeting.
B2 adjective /ʃɪər/

Sheer

Meaning
complete; absolute; transparent; very steep
Example
It was sheer luck that we found the place.
A2 noun /ˈswɛtər/

sweater

Meaning
a warm knitted piece of clothing worn on the upper body
Example
She wore a red sweater to keep warm in the cold weather.
B1 noun /ˈspæroʊ/

Sparrow

Meaning
small brown and grey bird commonly found in cities and towns
Example
The sparrow chirped cheerfully from the tree branch.
C2 noun /ˈʃaɪstər/

shyster

Meaning
a person, especially a lawyer, who uses unscrupulous or dishonest methods
Example
The businessman was exposed as a shyster who cheated clients.
C1 noun /ˈstaɪləs/

stylus

Meaning
a small tool used for writing, drawing, or touching screens
Example
She used a stylus to draw on her tablet.
C1 adjective /ˈskrɪptʃərəl/

scriptural

Meaning
Relating to or contained in the scriptures or holy writings.
Example
The priest gave a scriptural reference during the sermon.
C1 verb /sɪˈkluːd/

seclude

Meaning
To keep someone away from other people; to isolate.
Example
The monk chose to seclude himself in the mountains.
B2 verb /spɪl/

spill

Meaning
to cause liquid to flow or fall out of a container by accident
Example
Be careful not to spill your coffee.
B2 adjective /ˈspɛʃəˌlaɪzd/

specialized

Meaning
designed or developed for a particular purpose or function
Example
He has a specialized knowledge of ancient civilizations.
C1 noun /səbˈdʒɛkʃən/

subjection

Meaning
the act of bringing someone or something under control or domination
Example
The people suffered under the subjection of a cruel ruler.
B2 adjective /suːˈpɜːrb/

superb

Meaning
extremely good; excellent
Example
The hotel provided superb service during our stay.
C2 noun /ˈskɜː.vi/

scurvy

Meaning
A disease caused by a deficiency of vitamin C, leading to weakness, gum disease, and bleeding.
Example
Sailors often suffered from scurvy during long sea voyages without fresh fruits.
B1 noun /slaɪs/

Slice

Meaning
a thin, flat piece cut from something larger
Example
Would you like a slice of pizza?
B2 verb /ˈskræmbəl/

scramble

Meaning
to move or climb quickly using hands and feet; to mix or arrange in a hurried way
Example
The kids scrambled up the hill to catch the kite.
C2 noun səˈtaɪ.ə.ti

satiety

Meaning
The feeling of being satisfied or full, especially with regard to food.
Example
High-fiber foods provide longer satiety.
C1 verb /ˈskʌr.i/

scurry

Meaning
To move quickly with short, hurried steps.
Example
The mice scurried across the kitchen floor when the lights turned on.
C2 adjective /ˈsɛrid/

serried

Meaning
pressed or crowded together, often in rows or ranks
Example
The soldiers stood in serried ranks, ready for inspection.
B2 verb /stroʊk/

stroke

Meaning
to move your hand gently over something; to hit or touch something gently
Example
She stroked the cat's fur gently.
B2 adjective /ˈstɜːrdi/

sturdy

Meaning
strongly and solidly built; not easily weakened
Example
The carpenter made a sturdy wooden table.
B2 noun /ˌsɪm.ɪˈlær.ə.ti/

Similarity

Meaning
the quality or state of being similar; resemblance
Example
There is a striking similarity between the two paintings.
B2 verb /sɜːrdʒ/

surge

Meaning
to move suddenly and powerfully forward or upward
Example
The crowd surged forward when the gates opened.
C2 adjective /ˈsɪlvən/

sylvan

Meaning
Relating to or characteristic of the woods or forest.
Example
The cottage was set in a sylvan landscape full of tall trees.
C1 noun /ˈslændər/

Slander

Meaning
the action of making false spoken statements damaging to someone's reputation
Example
The politician sued the newspaper for slander.
C1 adjective /ˈswoʊlən/

swollen

Meaning
Enlarged or puffed up, usually due to injury, inflammation, or fluid accumulation
Example
Her ankle was swollen after she twisted it during the hike.
B2 verb /ˈspɛsɪfaɪ/

specify

Meaning
to state or describe something clearly and exactly
Example
Please specify the time and place of the meeting.
B2 noun ˈʃɔːtkʌmɪŋz

shortcomings

Meaning
A fault or failure to meet a certain standard; deficiencies.
Example
Institutional shortcomings affect student behavior negatively.
C2 adjective /spæzˈmɒdɪk/

spasmodic

Meaning
occurring irregularly or in sudden bursts
Example
The patient experienced spasmodic coughing during the night.
C1 noun /skraɪb/

scribe

Meaning
a person who writes documents, especially in ancient times; a professional copyist
Example
In ancient Egypt, scribes recorded important events.
B2 verb /siːz/

seize

Meaning
To take hold of suddenly and forcibly.
Example
The police managed to seize the stolen goods.
B1 noun /seɪk/

Sake

Meaning
purpose or reason for doing something; benefit or interest
Example
She worked overtime for the sake of her family's future.
C1 adjective /sɪˈkluːdɪd/

secluded

Meaning
Placed apart from other people or things; private and quiet.
Example
They spent their vacation in a secluded beach house.
A2 verb /swɪm/

swim

Meaning
to move through water using body movements
Example
I love to swim in the ocean during summer.
B2 noun /ˈsʌm.ɪt/

summit

Meaning
A high-level meeting between leaders, especially of governments; a conference.
Example
The summit addressed pressing global issues.
C1 noun /ˈsɛpərətɪst/

separatist

Meaning
A person who supports the separation of a group from a larger body, often for political or cultural independence.
Example
The separatist group demanded independence from the central government.
C1 adjective /səˈdɪs.tɪk/

sadistic

Meaning
Deriving pleasure from inflicting pain or suffering on others.
Example
The villain had a sadistic smile while hurting his enemies.
A2 noun /ˈsɪŋ.ər/

Singer

Meaning
a person who sings, especially as a job or profession
Example
The singer performed beautifully at the concert last night.
B2 adjective /stɜːrn/

Stern

Meaning
serious and demanding exact conformity to rules; strict and severe
Example
The teacher gave the students a stern warning about cheating.
C1 noun ˈsɛlf pəˈzɪʃən

self-possession

Meaning
The quality of being calm and confident and in control of one's emotions; composure.
Example
His self-possession during the crisis was remarkable.
B2 noun /ˈsɛnsər/

sensor

Meaning
a device that detects or measures a physical property and records, indicates, or responds to it
Example
The motion sensor turned on the light automatically.
C2 adjective /sæŋˈɡwɪniəs/

sanguineous

Meaning
Relating to blood; bloody.
Example
The surgeon examined the sanguineous discharge from the wound.
C2 adjective /sɪmˈfoʊniəs/

symphonious

Meaning
Harmonious; producing a pleasant sound or agreement of sound.
Example
The choir's voices were symphonious and filled the hall with beauty.
B1 verb /səˈraʊnd/

surround

Meaning
To be all around someone or something.
Example
Mountains surround the small village.
B2 adjective /ˈsɪnɪstər/

sinister

Meaning
Giving the impression that something harmful or evil is happening or will happen.
Example
The abandoned house had a sinister atmosphere.
C1 verb /ˈstɪɡmətaɪz/

stigmatize

Meaning
to describe or regard someone as worthy of disgrace or disapproval
Example
People with certain illnesses are often unfairly stigmatized.
A1 noun /sɛpˈtɛmbər/

september

Meaning
The ninth month of the year in the Gregorian calendar
Example
My birthday is in September, and I always celebrate it with friends.
C1 verb /skrɔːl/

scrawl

Meaning
to write or draw something quickly and carelessly, making it hard to read
Example
He scrawled his signature at the bottom of the page.
C2 adjective /ˌsɒfəˈmɒrɪk/

sophomoric

Meaning
showing immaturity and overconfidence, like a sophomore
Example
His sophomoric behavior embarrassed his friends.
C1 verb /ˈskʌt.əl/

scuttle

Meaning
To run hurriedly with short, quick steps; or to deliberately sink a ship.
Example
The children scuttled back to their seats when the teacher entered.
A2 adverb /ˈslaɪtli/

slightly

Meaning
to a small degree or extent
Example
The temperature has slightly increased today.
C2 noun ˌsʌb.dʒʊˈɡeɪ.ʃən

subjugation

Meaning
The action of bringing someone or something under domination or control, especially by force.
Example
The subjugation of weaker nations by colonial powers shaped history.
C2 verb /ˈskærɪfaɪ/

scarify

Meaning
to make shallow cuts or scratches; to loosen the surface of soil
Example
The farmer scarified the soil before planting seeds.
C1 noun /sɪˈnɪləti/

senility

Meaning
The state of being old and showing the weaknesses of age, especially mental decline.
Example
His forgetfulness was attributed to senility.
B2 adverb /ˈsmuːð.li/

Smoothly

Meaning
without problems or difficulties; in an even and regular way
Example
The car runs smoothly on the new highway.
C1 verb/noun /snɑːrl/

snarl

Meaning
to growl aggressively with bared teeth; a tangle or mess
Example
The dog snarled at the stranger near the gate.
C1 noun /sɪˈnɒpsɪs/

synopsis

Meaning
a brief summary of the main points of a text, film, or research
Example
The publisher asked the author to submit a one-page synopsis of the novel.
B2 noun /ˈskriːnɪŋ/

screening

Meaning
the act of examining or testing people to detect disease or evaluate suitability; a showing of a movie or program
Example
The hospital offered free health screening for all employees.
C1 verb /smɛlt/

smelt

Meaning
to extract metal from its ore by heating and melting
Example
The workers smelt iron from its ore in the factory.
B1 adverb /səˈpraɪzɪŋli/

surprisingly

Meaning
in a way that causes surprise or amazement
Example
Surprisingly, she finished the entire project in just one day.
C1 noun /spɛk/

speck

Meaning
A very small spot, mark, or particle.
Example
There was a tiny speck of dust on the glass table.
A2 noun /ˈsɒkər/

soccer

Meaning
a sport in which two teams of eleven players each try to score goals by kicking a ball into the opposing goal
Example
He loves to play soccer with his friends.
B2 verb /slæm/

slam

Meaning
to close or hit something with great force
Example
He slammed the door angrily after the argument.
C1 noun, verb /səˈpiːnə/

subpoena

Meaning
a legal document ordering someone to attend court; to summon someone with such a document
Example
The witness received a subpoena to appear in court next week.
B1 adjective ˈʃɔːrt.tɜːrm

short-term

Meaning
Occurring over or involving a relatively short period of time.
Example
Investing in stocks can yield short-term profits.
C1 adjective /ˈsiː.di/

Seedy

Meaning
squalid and disreputable; shabby and run-down; full of seeds
Example
They avoided walking through the seedy part of town at night.
C2 noun /ˈstænʃən/

stanchion

Meaning
a strong upright bar or post used as support or to control movement
Example
The red rope was attached to the stanchions to guide the crowd.
C1 adjective /ˈsɪn.tɪ.leɪ.tɪŋ/

scintillating

Meaning
brilliantly clever, exciting, or sparkling
Example
Her scintillating conversation kept everyone entertained.
B1 verb /swɪtʃ/

switch

Meaning
to change from one thing to another; to exchange or replace
Example
I switched from coffee to tea.
B1 noun /ˌsaʊθˈwɛst/

southwest

Meaning
the direction that is between south and west; a region in that direction
Example
They traveled to the southwest of the country for their vacation.
B2 verb /ˈstrʌɡlɪŋ/

struggling

Meaning
Making forceful or violent efforts to get free of restraint or constriction; having difficulty achieving something.
Example
Many regions are struggling with economic recovery.
B2 noun /ˌsuːpərɪnˈtɛndənt/

superintendent

Meaning
a person who oversees, manages, or directs an organization, building, or project
Example
The superintendent visited the classrooms to check on progress.
A2 adverb /ˈseɪf.li/

Safely

Meaning
in a safe manner; without danger or risk
Example
Drive safely on the icy road.
B1 adverb /sɪnˈsɪrli/

sincerely

Meaning
with genuine feelings; honestly and truly
Example
I sincerely hope you recover soon.
B2 adjective /swɪft/

swift

Meaning
moving very quickly; happening promptly
Example
The river current was swift after the heavy rain.
C2 noun /sɛkˈstɛt/

sextet

Meaning
a group of six people playing music or a piece written for six performers
Example
The jazz sextet filled the small club with a warm, layered sound.
B1 verb /sɪŋk/

sink

Meaning
to go down below the surface; to descend
Example
The ship sinks in the deep ocean.
C1 adjective /ˈskwɒlɪd/

squalid

Meaning
extremely dirty and unpleasant, often due to poverty or neglect
Example
He lived in a squalid room with broken furniture.
B1 verb /ʃaʊt/

shout

Meaning
to say something very loudly
Example
He shouted at the top of his lungs to get their attention.
A2 noun ˈsaɪən.tɪst

scientist

Meaning
A person who is studying or has expert knowledge of one or more of the natural or physical sciences.
Example
The scientist proposed data-driven reforms.
C2 noun /skʌlˈdʌɡəri/

skulduggery

Meaning
underhanded or dishonest behavior
Example
The politician was accused of financial skulduggery.
B2 noun /sfɪər/

sphere

Meaning
a round, three-dimensional shape that is perfectly symmetrical around its center; an area of activity or knowledge
Example
The Earth is almost a perfect sphere.
B2 verb /ˈskætər/

scatter

Meaning
to spread or throw around in different directions
Example
The wind scattered the leaves across the yard.
C1 adjective /sɔɪld/

soiled

Meaning
dirty or stained; not clean
Example
His clothes were soiled after playing in the mud.
A2 noun, verb /ʃɒt/

shot

Meaning
a single attempt to hit something, usually with a weapon or a ball
Example
He took a shot at the goal.
C1 /splɪnt/

splint

Meaning
A rigid device used to support and immobilize a broken or injured body part.
Example
The doctor applied a splint to stabilize the patient's broken arm.
C1 noun /ˈsɛdətɪv/

sedative

Meaning
A substance that calms the nerves or induces sleep.
Example
The doctor prescribed a sedative to help the patient sleep.
B2 noun smɔːl ˈɛfərt

Small Effort

Meaning
Minor actions or initiatives that can collectively make a significant impact.
Example
Small efforts can bring big changes in butterfly conservation.
B1 noun /ˈʃed.juːl/

Schedule

Meaning
a plan that lists things or events and the times when they will happen; timetable
Example
Please check your schedule before confirming the meeting time.
C2 adjective /ˈsʌpliənt/

suppliant

Meaning
Humbly or earnestly asking for something, especially from a person in authority.
Example
The suppliant man begged for mercy at the king's feet.
C2 noun /ˈsɒfɪstri/

sophistry

Meaning
the use of clever but false arguments, often to deceive
Example
The politician's speech was full of sophistry.
C2 adjective /sɪˈlæbɪk/

syllabic

Meaning
Relating to or based on syllables.
Example
The teacher explained the syllabic structure of the word.
C1 adjective /sɪər/

Sear

Meaning
withered; dried up; burned or scorched
Example
The sear leaves fell from the trees in autumn.
C2 verb /sleɪk/

slake

Meaning
To satisfy thirst or desire.
Example
She drank cold water to slake her thirst.
C1 adjective ˌsɪn.əˈdʒɪs.tɪk

synergistic

Meaning
Relating to the interaction of elements that when combined produce a greater effect than the sum of their individual effects.
Example
A synergistic effect occurs when nutrients work together.
B2 verb /sweɪ/

sway

Meaning
To move or cause to move slowly or rhythmically back and forth; to influence someone's opinion or decision.
Example
The trees swayed gently in the breeze.
C2 noun /sɪlf/

sylph

Meaning
A mythical spirit of the air; also refers to a slender, graceful woman.
Example
She moved across the stage like a sylph, light and graceful.
B2 noun /swiːt/

suite

Meaning
a set of rooms designated for one person's or family's use or for a particular purpose
Example
They stayed in the presidential suite at the hotel.
B2 adjective /ˈsteɪʃəˌneri/

stationary

Meaning
Not moving or not intended to be moved.
Example
The car remained stationary at the red light.