surveillance
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B2 noun /sɜːˈveɪ.ləns/

surveillance

Meaning
Close observation, especially of a suspected spy or criminal; continuous watching of a place, person, or situation.
Example
Government agencies conduct surveillance on cyber threats.
B2 adjective sɪˈvɪər

severe

Meaning
Very great; intense or extreme in degree.
Example
Without action, climate change impacts will become severe.
B1 noun /ˈsɜːvənt/

servant

Meaning
a person who performs duties for others, especially in a household
Example
The servant opened the door for the guests.
A2 noun /ˈstændərd/

standard

Meaning
a level of quality or achievement, or a measure of comparison
Example
This car meets all the safety standards.
B2 noun /ˈstɑːrtər/

starter

Meaning
a person or thing that starts something; the first course of a meal
Example
The starter of the meal was a fresh salad.
C1 noun /ˈsɑːɡə/

saga

Meaning
A long story of heroic achievement, or a long, complex series of events.
Example
The company's rise and fall became a corporate saga.
B1 noun /sɔɪl/

soil

Meaning
The upper layer of earth in which plants grow.
Example
The soil in this area is reddish.
C1 noun /slɪt/

Slit

Meaning
a long narrow opening or cut
Example
There was a small slit in the fabric.
A1 verb /sel/

sell

Meaning
to give something to someone in exchange for money
Example
They sell fresh fruits at the market.
B1 noun /swet/

Sweat

Meaning
moisture exuded through the pores of the skin, typically as a reaction to heat, physical exertion, fever, or fear
Example
After running for an hour, he was covered in sweat.
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.
C1 verb /ʃɜːrk/

shirk

Meaning
to avoid or neglect a duty or responsibility
Example
He always tries to shirk his responsibilities at work.
A1 pronoun /ˈsʌmwʌn/

someone

Meaning
a person, but not specifically known or named
Example
Someone left their umbrella in the hallway.
C2 verb /səˈbɔːrn/

suborn

Meaning
to bribe or induce someone unlawfully to perform an act, especially to commit perjury
Example
The lawyer was accused of trying to suborn a witness.
C2 adjective /stɛnˈtɔːriən/

stentorian

Meaning
Extremely loud and powerful in sound.
Example
The teacher’s stentorian voice quieted the noisy classroom.
C2 noun /ˈspæŋɡəl/

spangle

Meaning
A small shiny piece of metal or plastic used for decoration on clothes.
Example
Her dress was covered with silver spangles that glittered in the light.
B2 noun /ˌsɛlf ɪˈstiːm/

self-esteem

Meaning
confidence in one's own worth or abilities; self-respect
Example
Building self-esteem takes time and consistent effort.
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.
C1 verb /ˈʃɪmər/

shimmer

Meaning
To shine with a soft, wavering light.
Example
The lake shimmered under the moonlight.
A2 adjective /ˈspænɪʃ/

spanish

Meaning
relating to Spain or the Spanish language
Example
She is fluent in Spanish and French.
B2 noun /spæn/

span

Meaning
the full extent or length of something from one end to another
Example
The bridge has a span of over 500 meters.
B2 noun /ˈsɪmptəm/

symptom

Meaning
a sign or indication of something, especially of an illness
Example
Fever is a common symptom of the flu.
B2 verb /ˈspɛʃəˌlaɪz/

specialize

Meaning
to focus on a particular subject or activity and become an expert in it
Example
He decided to specialize in cardiology.
B2 verb /stɑːv/

starve

Meaning
to suffer or die from lack of food
Example
He was left to starve in the desert.
B1 noun /ʃɑːrk/

Shark

Meaning
a large marine fish with sharp teeth and a cartilaginous skeleton
Example
The shark is a powerful predator of the ocean.
C1 noun /sɪlt/

silt

Meaning
Fine sand, clay, or other material carried by running water and deposited as a sediment.
Example
The river deposited layers of silt along its banks.
B1 noun, verb /stɒk/

stock

Meaning
a supply of goods kept for sale or use; to keep or fill with goods
Example
The shop stocks a wide variety of products.
B2 noun /sliːv/

Sleeve

Meaning
the part of a garment that covers the arm
Example
She rolled up her sleeves before starting to cook.
B2 verb /ˈstɑːrtl/

startle

Meaning
To surprise or frighten someone suddenly.
Example
The loud noise startled the children.
A2 adjective /ˈskeəri/

scary

Meaning
causing fear or making you feel frightened
Example
That horror movie was really scary.
C2 verb /skwɛltʃ/

squelch

Meaning
to make a soft sucking sound, such as when walking on mud; to suppress or silence
Example
His boots squelched in the wet ground.
C1 verb /ˈstæmər/

stammer

Meaning
To speak with sudden involuntary pauses and a tendency to repeat the initial letters of words.
Example
The nervous student began to stammer during his speech.
B1 noun /ˈsɛt ʌp/

set-up

Meaning
The arrangement or organization of something; a planned structure or scheme
Example
The company presented a new set-up for the office layout.
A2 adjective /ˈsɪmələr/

Similar

Meaning
alike; having characteristics in common
Example
The two sisters have similar interests in music.
B2 adjective /ˈsɪk.li/

Sickly

Meaning
weak and unhealthy; prone to illness; appearing weak or pale
Example
The sickly child needed extra care and attention.
C2 adjective /ˌsæsərˈdoʊtl/

sacerdotal

Meaning
Relating to priests or the priesthood.
Example
The ritual had a distinctly sacerdotal character.
A2 noun /skɜːrt/

Skirt

Meaning
a garment that hangs from the waist and covers part or all of the legs
Example
She chose a blue skirt to match her blouse.
B2 noun /ˈsiː.mən/

Seaman

Meaning
a person who works on a ship; sailor
Example
The experienced seaman navigated the ship through the storm.
B2 noun /ˈsɜːdʒən/

surgeon

Meaning
a doctor who performs medical operations
Example
The surgeon performed a complex heart operation.
C1 adjective/noun /ˈsʌkjələnt/

succulent

Meaning
Juicy or full of juice; also refers to a plant with thick, fleshy leaves adapted to storing water.
Example
The steak was so succulent that everyone enjoyed it.
C1 noun /səbˈvɜːrʒən/

subversion

Meaning
the act of trying to destroy or undermine an established system or authority
Example
The government accused the rebels of planning subversion.
B2 verb /ˈspɛsɪfaɪ/

specify

Meaning
to state or describe something clearly and exactly
Example
Please specify the time and place of the meeting.
C2 adjective /sɪˈnɒptɪk/

synoptic

Meaning
giving a general overview or summary; presenting a broad view
Example
The report offers a synoptic view of climate trends over the past century.
C1 noun/verb /ˈskɜːrmɪʃ/

skirmish

Meaning
a small or brief fight between groups of soldiers; to engage in such a fight
Example
The soldiers got into a skirmish near the border.
C1 noun, adjective, verb /səˈbɔːrdənət/ (noun/adjective), /səˈbɔːrdəˌneɪt/ (verb)

subordinate

Meaning
lower in rank or position; to treat as less important
Example
He manages ten subordinates in his department.
C1 verb /səˈfɪstɪkeɪt/

sophisticate

Meaning
to make something more complex or refined; to educate or develop in taste and manners
Example
Traveling abroad helped sophisticate his worldview.
C1 noun /skɪt/

skit

Meaning
a short, humorous performance or piece of writing
Example
The students performed a funny skit at the event.
B2 verb /spɛər/

spare

Meaning
To give something that one has extra of; to refrain from harming or killing.
Example
Could you spare me a few minutes of your time?
C1 noun /ˈʃɜːrbət/

sherbet

Meaning
a sweet flavored drink or a frozen dessert made from sweetened fruit juice
Example
On hot days, she enjoys a glass of lemon sherbet.
B2 verb /səˈluːt/

salute

Meaning
to greet with respect; to honor
Example
The soldiers saluted their commanding officer.
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 noun /ˈsaʊər wʊd ˈæp.əl/

Sour wood apple

Meaning
a tropical fruit with hard shell and tangy flesh; elephant apple
Example
The sour wood apple has a unique taste that many people enjoy.
C2 noun /sneɪk ɡɔːrd/

Snake gourd

Meaning
a long, curved vegetable that resembles a snake, commonly used in South Asian cuisine
Example
The snake gourd grows in a twisted, serpentine shape in the garden.
C1 noun ˌsæn.ɪ.taɪˈzeɪ.ʃən

sanitization

Meaning
The process of cleaning and disinfecting to eliminate germs and bacteria.
Example
Regular sanitization keeps appliances germ-free.
C1 noun ˈsʌfrɪdʒ

suffrage

Meaning
The right to vote in political elections; the principle of political representation.
Example
Universal suffrage was a key demand.
B2 adjective, verb (past) /səˈspɛndɪd/

suspended

Meaning
Temporarily not allowed, stopped, or hanging.
Example
He was suspended from school for a week.
A2 adjective /sɪk/

Sick

Meaning
unwell; having a disease or illness; feeling nauseous
Example
She stayed home from work because she was feeling sick.
C2 adjective /svelt/

svelte

Meaning
Attractively thin, graceful, and elegant in appearance or movement.
Example
She looked svelte in the elegant black dress.
B1 adjective /səˈfɪʃənt/

Sufficient

Meaning
enough; adequate for the purpose; satisfactory
Example
We have sufficient time to complete the project.
C2 noun /ˈslæt.ən/

slattern

Meaning
a woman who is untidy or slovenly in appearance or habits
Example
The house looked as if a slattern lived there.
A2 adverb /ˈsʌm.weər/

Somewhere

Meaning
in or at some place; in an unspecified location
Example
I left my keys somewhere in the house.
C1 adjective /ˈʃeɪm.ləs/

Shameless

Meaning
having no shame; bold and rude; impudent
Example
The shameless politician refused to apologize for his mistakes.
A1 verb /steɪ/

stay

Meaning
to remain in the same place; to continue being
Example
Please stay here until I return.
C2 adjective /ˈsætərˌnaɪn/

saturnine

Meaning
slow and gloomy in mood
Example
His saturnine expression made everyone in the room uncomfortable.
C1 verb ˈsɪn.ɚ.dʒaɪz

synergize

Meaning
combine in such a way as to enhance effectiveness.
Example
The departments must synergize to improve efficiency.
C2 noun /spʌndʒ ɡɔːrd/

Sponse gourd

Meaning
a fibrous gourd that becomes sponge-like when dried, used for cleaning and in cooking when young
Example
The sponge gourd can be eaten when young or dried to make natural scrubbers.
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.
C1 noun /səbˈmɪtəl/

submittal

Meaning
the act of submitting something, especially a document for consideration or approval
Example
The contractor sent the submittal to the client for approval.
C1 adjective /ˈskwiːmɪʃ/

squeamish

Meaning
easily made to feel sick, faint, or disgusted
Example
She felt squeamish at the sight of blood.
C2 noun /skæd/

scad

Meaning
A type of fish of the jack family; also informally means a large number or quantity.
Example
The fisherman caught a scad in the net.
C1 noun səˈlɪnɪti ɪnˈtruːʒən

salinity intrusion

Meaning
The movement of salt water into freshwater areas, typically affecting coastal regions.
Example
Salinity intrusion affects coastal regions.
B1 noun /ˈsteɪtəs/

status

Meaning
the social or professional position or condition of someone or something
Example
His social status improved after the promotion.
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 noun /ˈsɜr.neɪm/

Surname

Meaning
a hereditary name common to all members of a family; family name
Example
Please write your first name and surname on the form.
B2 verb /ˈskroʊlɪŋ/

scrolling

Meaning
Moving through content on a screen by sliding up or down.
Example
Scrolling through feeds wastes a lot of time.
A2 noun /ˈsoʊʃəl ˈmiːdiə/

social media

Meaning
Websites and applications that enable users to create and share content or to participate in social networking.
Example
Social media often causes delays.
C2 noun /skɪf/

skiff

Meaning
a small, light boat usually for one person
Example
The fisherman paddled his skiff across the lake.
C1 adjective /ˌsuː.pəˈsɒn.ɪk/

Supersonic

Meaning
faster than the speed of sound; relating to speeds greater than the speed of sound
Example
The supersonic jet broke the sound barrier.
C1 adjective /ˈsʌbstəntɪv/

substantive

Meaning
Having a firm basis in reality; important, meaningful, or considerable.
Example
The company made substantive changes to its policy.
C1 adjective /ˈspeɪʃəl/

spatial

Meaning
relating to space or the position, area, and size of things
Example
The scientist studied the spatial arrangement of stars.
C1 verb/noun /ˈsɒldər/

solder

Meaning
To join metal parts together by melting and putting a filler metal into the joint
Example
He soldered the broken wires back together.
A2 noun /ˈseɪf.ti/

Safety

Meaning
condition of being protected from danger, risk, or injury
Example
The company prioritizes workplace safety above all else.
A1 adverb /soʊ/

so

Meaning
to such a degree or extent
Example
She was so happy with the gift.
B2 noun, adjective /ˈsoʊʃəlɪst/

socialist

Meaning
a person who advocates for socialism; relating to socialism
Example
He is a well-known socialist writer.
C1 noun /ˈsuːtər/

suitor

Meaning
a man who pursues a relationship with a woman, often with the intent to marry
Example
She had many suitors vying for her attention.
A2 noun ˈsaɪəns

science

Meaning
The intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.
Example
Science continues to explore the unknown.
C2 adjective /ˌsuːpərˈæn.ju.eɪ.tɪd/

superannuated

Meaning
old and no longer useful or valid; retired due to age
Example
The factory was filled with superannuated machines that slowed production.
C1 adjective /ˈskrʌmpʃəs/

scrumptious

Meaning
extremely tasty or delicious
Example
She baked a scrumptious chocolate cake for the party.
C1 noun ˈsɪn.tæks

syntax

Meaning
The arrangement of words and phrases to create well-formed sentences in a language.
Example
Programming languages follow strict syntax rules.
B2 noun /ˈsɑːrˌkæzəm/

sarcasm

Meaning
The use of irony to mock or convey contempt.
Example
His sarcasm often made people laugh but sometimes offended them.
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.
C1 adjective /suːˈpɜːr.flu.əs/

superfluous

Meaning
Unnecessary, especially through being more than enough.
Example
His speech contained too many superfluous details.
B2 verb /səbˈmɪt/

submit

Meaning
to present for consideration; to surrender; to yield
Example
Please submit your assignment by Friday.
C2 verb /ˈsʌbdʒʊˌɡeɪt/

subjugate

Meaning
To bring under domination or control, especially by conquest.
Example
The empire sought to subjugate the neighboring kingdoms.
C2 verb /ˌsuːpərɪnˈtɛnd/

superintend

Meaning
to oversee and direct the work or operation of something
Example
She was hired to superintend the construction project.
C1 adjective /snaɪd/

snide

Meaning
mocking or insulting in an indirect way
Example
He couldn’t resist making a snide comment about her dress.
C1 /skwɒt/

squat

Meaning
to crouch or sit with knees bent and body close to the ground
Example
He squatted down to tie his shoes.
C2 noun /ˈsɛrəf/

seraph

Meaning
An angelic being associated with light and purity, often depicted as a high-ranking angel in Christian theology.
Example
The stained-glass window depicted a seraph with outstretched wings.
C2 adjective /səˈpʌlkrəl/

sepulchral

Meaning
Relating to a tomb or burial; gloomy, dismal.
Example
The abandoned house had a sepulchral silence about it.
A2 adjective /ˈsɛvənθ/

seventh

Meaning
constituting number seven in a sequence; coming after the sixth
Example
Her birthday is on the seventh of July.
B2 noun /ˈspɒt.laɪt/

spotlight

Meaning
a strong beam of light directed onto a particular area; figuratively, public attention
Example
The singer stood proudly in the spotlight.
C1 adjective ˌsʌbˈlɪm.ɪ.nəl

subliminal

Meaning
Existing or operating below the threshold of consciousness; perceived by or affecting someone's mind without their being aware of it.
Example
Advertisements often have subliminal messages.
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.
A1 noun /saɪd/

side

Meaning
a position to the left or right of something
Example
The store is on the side of the road.
A1 noun /ʃuː/

Shoe

Meaning
covering for the foot, typically made of leather or cloth
Example
She bought a new pair of running shoes for exercise.
C1 noun /ˈsɜːr.vɪ.tuːd/

Servitude

Meaning
the state of being a slave or completely subject to someone more powerful
Example
Many people fought to escape the servitude imposed by the colonial system.
B2 noun /ˈskɛlɪtən/

skeleton

Meaning
The internal framework of bones that supports the body of a human or animal.
Example
The teacher showed the students a human skeleton in the biology class.
B2 noun /səˈlɪsɪtər/

solicitor

Meaning
A type of lawyer who gives legal advice and prepares legal documents, often representing clients in lower courts.
Example
She consulted a solicitor before signing the contract.
B2 noun ˈsɪblɪŋz

Siblings

Meaning
Each of two or more children or offspring having one or both parents in common.
Example
Siblings are usually placed on the same level in a family tree.
B2 noun /ˌsuːvəˈnɪər/

Souvenir

Meaning
a thing that is kept as a reminder of a person, place, or event; a memento
Example
I bought a small souvenir from the gift shop.
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.
A1 adjective /sæd/

sad

Meaning
feeling or showing sorrow; unhappy
Example
She felt sad after hearing the bad news.
C1 noun /ˈsaɪd.laɪn dɪˈskʌʃənz/

sideline discussions

Meaning
Informal or secondary conversations that occur outside the main agenda of a formal meeting.
Example
Sideline discussions often lead to agreements.
C1 adjective /ˈskeɪðɪŋ/

scathing

Meaning
severely critical; harshly scornful
Example
The critic wrote a scathing review of the movie.
C2 adjective /ˈstɪdʒiən/

stygian

Meaning
extremely dark, gloomy, or forbidding
Example
They walked through the stygian cave with torches.
C1 noun /slæb/

slab

Meaning
a large, thick, flat piece of stone, concrete, or other hard material
Example
The workers laid a concrete slab for the foundation.
C1 adjective /ˈskɪtɪʃ/

skittish

Meaning
easily frightened or nervous; unpredictable
Example
The horse was too skittish to ride.
A2 noun /stoʊn/

stone

Meaning
a hard, naturally occurring mineral material found in the earth
Example
He threw a stone into the lake.
B1 verb /swɪtʃ/

switch

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