sacrifice – To make an offering of to deity, especially by presenting on an altar.
sacrificial – Offering or offered as an atonement for sin.
sacrilege – The act of violating or profaning anything sacred.
sacrilegious – Impious.
safeguard – To protect.
sagacious – Able to discern and distinguish with wise perception.
salacious – Having strong sexual desires.
salience – The condition of standing out distinctly.
salient – Standing out prominently.
saline – Constituting or consisting of salt.
salutary – Beneficial.
salutation – Any form of greeting, hailing, or welcome, whether by word or act.
salutatory – The opening oration at the commencement in American colleges.
salvage – Any act of saving property.
salvo – A salute given by firing all the guns, as at the funeral of an officer.
sanctimonious – Making an ostentatious display or hypocritical pretense of holiness or piety.
sanction – To approve authoritatively.
sanctity – Holiness.
sanguinary – Bloody.
sanguine – Having the color of blood.
sanguineous – Consisting of blood.
sapid – Affecting the sense of taste.
sapience – Deep wisdom or knowledge.
sapient – Possessing wisdom.
sapiential – Possessing wisdom.
saponaceous – Having the nature or quality of soap.
sarcasm – Cutting and reproachful language.
sarcophagus – A stone coffin or a chest-like tomb.
sardonic – Scornfully or bitterly sarcastic.
satiate – To satisfy fully the appetite or desire of.
satire – The employment of sarcasm, irony, or keenness of wit in ridiculing vices.
satiric – Resembling poetry, in which vice, incapacity ,or corruption is held up to ridicule.
satirize – To treat with sarcasm or derisive wit.
satyr – A very lascivious person.
savage – A wild and uncivilized human being.
savor – To perceive by taste or smell.
scabbard – The sheath of a sword or similar bladed weapon.
scarcity – Insufficiency of supply for needs or ordinary demands.
scholarly – Characteristic of an erudite person.
scholastic – Pertaining to education or schools.
scintilla – The faintest ray.
scintillate – To emit or send forth sparks or little flashes of light.
scope – A range of action or view.
scoundrel – A man without principle.
scribble – Hasty, careless writing.
scribe – One who writes or is skilled in writing.
script – Writing or handwriting of the ordinary cursive form.
Scriptural – Pertaining to, contained in, or warranted by the Holy Scriptures.
scruple – Doubt or uncertainty regarding a question of moral right or duty.
scrupulous – Cautious in action for fear of doing wrong.
scurrilous – Grossly indecent or vulgar.
scuttle – To sink (a ship) by making holes in the bottom.
scythe – A long curved blade for mowing, reaping, etc.
séance – A meeting of spirituals for consulting spirits.
sear – To burn on the surface.
sebaceous – Pertaining to or appearing like fat.
secant – Cutting, especially into two parts.
secede – To withdraw from union or association, especially from a political or religious body.
secession – Voluntary withdrawal from fellowship, especially from political or religious bodies.
seclude – To place, keep, or withdraw from the companionship of others.
seclusion – Solitude.
secondary – Less important or effective than that which is primary.
secondly – In the second place in order or succession.
second-rate – Second in quality, size, rank, importance, etc.
secrecy – Concealment.
secretary – One who attends to correspondence, keeps records. or does other writing for others.
secretive – Having a tendency to conceal.
sedate – Even-tempered.
sedentary – Involving or requiring much sitting.
sediment – Matter that settles to the bottom of a liquid.
sedition – Conduct directed against public order and the tranquility of the state.
seditious – Promotive of conduct directed against public order and the tranquility of the state.
seduce – To entice to surrender chastity.
sedulous – Persevering in effort or endeavor.
seer – A prophet.
seethe – To be violently excited or agitated.
seignior – A title of honor or respectful address, equivalent to sir.
seismograph – An instrument for recording the phenomena of earthquakes.
seize – To catch or take hold of suddenly and forcibly.
selective – Having the power of choice.
self-respect – Rational self-esteem.
semblance – Outward appearance.
semicivilized – Half-civilized.
semiconscious – Partially conscious.
semiannual – Recurring at intervals of six months.
semicircle – A half-circle.
seminar – Any assemblage of pupils for real research in some specific study under a teacher.
seminary – A special school, as of theology or pedagogics.
senile – Peculiar to or proceeding from the weakness or infirmity of old age.
sensation – A condition of mind resulting from spiritual or inherent feeling.
sense – The signification conveyed by some word, phrase, or action.
sensibility – Power to perceive or feel.
sensitive – Easily affected by outside operations or influences.
sensorium – The sensory apparatus.
sensual – Pertaining to the body or the physical senses.
sensuous – Having a warm appreciation of the beautiful or of the refinements of luxury.
sentence – A related group of words containing a subject and a predicate and expressing a complete thought.
sentience – Capacity for sensation or sense-perception.
sentient – Possessing the power of sense or sense-perception.
sentinel – Any guard or watch stationed for protection.
separable – Capable of being disjoined or divided.
separate – To take apart.
separatist – A seceder.
septennial – Recurring every seven years.
sepulcher – A burial-place.
sequacious – Ready to be led.
sequel – That which follows in consequence of what has previously happened.
sequence – The order in which a number or persons, things, or events follow one another in space or time.
sequent – Following in the order of time.
sequester – To cause to withdraw or retire, as from society or public life.
sequestrate – To confiscate.
sergeant – A non-commissioned military officer ranking next above a corporal.
sergeant-at-arms – An executive officer in legislative bodies who enforces the orders of the presiding officer.
sergeant-major – The highest non-commissioned officer in a regiment.
service – Any work done for the benefit of another.
serviceable – Durable.
servitude – Slavery.
severance – Separation.
severely – Extremely.
sextet – A band of six singers or players.
sextuple – Multiplied by six.
sheer – Absolute.
shiftless – Wanting in resource, energy, or executive ability.
shrewd – Characterized by skill at understanding and profiting by circumstances.
shriek – A sharp, shrill outcry or scream, caused by agony or terror.
shrinkage – A contraction of any material into less bulk or dimension.
shrivel – To draw or be drawn into wrinkles.
shuffle – A mixing or changing the order of things.
sibilance – A hissing sound.
sibilant – Made with a hissing sound.
sibilate – To give a hissing sound to, as in pronouncing the letter s.
sidelong – Inclining or tending to one side.
sidereal – Pertaining to stars or constellations.
siege – A beleaguerment.
significance – Importance.
significant – Important, especially as pointing something out.
signification – The meaning conveyed by language, actions, or signs.
similar – Bearing resemblance to one another or to something else.
simile – A comparison which directs the mind to the representative object itself.
similitude – Similarity.
simplify – To make less complex or difficult.
simulate – Imitate.
simultaneous – Occurring, done, or existing at the same time.
sinecure – Any position having emoluments with few or no duties.
singe – To burn slightly or superficially.
sinister – Evil.
sinuosity – The quality of curving in and out.
sinuous – Curving in and out.
sinus – An opening or cavity.
siren – A sea-nymph, described by Homer as dwelling between the island of Circe and Scylla.
sirocco – hot winds from Africa.
sisterhood – A body of sisters united by some bond of sympathy or by a religious vow.
skeptic – One who doubts any statements.
skepticism – The entertainment of doubt concerning something.
skiff – Usually, a small light boat propelled by oars.
skirmish – Desultory fighting between advanced detachments of two armies.
sleight – A trick or feat so deftly done that the manner of performance escapes observation.
slight – Of a small importance or significance.
slothful – Lazy.
sluggard – A person habitually lazy or idle.
sociable – Inclined to seek company.
socialism – A theory of civil polity that aims to secure the reconstruction of society.
socialist – One who advocates reconstruction of society by collective ownership of land and capital.
sociology – The philosophical study of society.
Sol – The sun.
solace – Comfort in grief, trouble, or calamity.
solar – Pertaining to the sun.
solder – A fusible alloy used for joining metallic surfaces or margins.
soldier – A person engaged in military service.
solecism – Any violation of established rules or customs.
solicitor – One who represents a client in court of justice; an attorney.
solicitude – Uneasiness of mind occasioned by desire, anxiety, or fear.
soliloquy – A monologue.
solstice – The time of year when the sun is at its greatest declination.
soluble – Capable of being dissolved, as in a fluid.
solvent – Having sufficient funds to pay all debts.
somber – Gloomy.
somniferous – Tending to produce sleep.
somnolence – Oppressive drowsiness.
somnolent – Sleepy.
sonata – An instrumental composition.
sonnet – A poem of fourteen decasyllabic or octosyllabiclines expressing two successive phrases.
sonorous – Resonant.
soothsayer – One who claims to have supernatural insight or foresight.
sophism – A false argument understood to be such by the reasoner himself and intentionally used to deceive
sophistical – Fallacious.
sophisticate – To deprive of simplicity of mind or manner.
sophistry – Reasoning sound in appearance only, especially when designedly deceptive.
soprano – A woman’s or boy’s voice of high range.
sorcery – Witchcraft.
sordid – Of degraded character or nature.
souvenir – A token of remembrance.
sparse – Thinly diffused.
Spartan – Exceptionally brave; rigorously severe.
spasmodic – Convulsive.
specialize – To assume an individual or specific character, or adopt a singular or special course.
specialty – An employment limited to one particular line of work.
specie – A coin or coins of gold, silver, copper, or other metal.
species – A classificatory group of animals or plants subordinate to a genus.
specimen – One of a class of persons or things regarded as representative of the class.
specious – Plausible.
spectator – One who beholds or looks on.
specter – Apparition.
spectrum – An image formed by rays of light or other radiant energy.
speculate – To pursue inquiries and form conjectures.
speculator – One who makes an investment that involves a risk of loss, but also a chance of profit.
sphericity – The state or condition of being a sphere.
spheroid – A body having nearly the form of a sphere.
spherometer – An instrument for measuring curvature or radii of spherical surfaces.
spinous – Having spines.
spinster – A woman who has never been married.
spontaneous – Arising from inherent qualities or tendencies without external efficient cause.
sprightly – Vivacious.
spurious – Not genuine.
squabble – To quarrel.
squalid – Having a dirty, mean, poverty-stricken appearance.
squatter – One who settles on land without permission or right.
stagnant – Not flowing: said of water, as in a pool.
stagnate – To become dull or inert.
stagnation – The condition of not flowing or not changing.
stagy – Having a theatrical manner.
staid – Of a steady and sober character.
stallion – An uncastrated male horse, commonly one kept for breeding.
stanchion – A vertical bar, or a pair of bars, used to confine cattle in a stall.
stanza – A group of rimed lines, usually forming one of a series of similar divisions in a poem.
statecraft – The art of conducting state affairs.
static – Pertaining to or designating bodies at rest or forces in equilibrium.
statics – The branch of mechanics that treats of the relations that subsist among forces in order.
stationary – Not moving.
statistician – One who is skilled in collecting and tabulating numerical facts.
statuesque – Having the grace, pose, or quietude of a statue.
statuette – A figurine.
stature – The natural height of an animal body.
statute – Any authoritatively declared rule, ordinance, decree, or law.
stealth – A concealed manner of acting.
stellar – Pertaining to the stars.
steppe – One of the extensive plains in Russia and Siberia.
sterling – Genuine.
stifle – To smother.
stigma – A mark of infamy or token of disgrace attaching to a person as the result of evil- doing.
stiletto – A small dagger.
stimulant – Anything that rouses to activity or to quickened action.
stimulate – To rouse to activity or to quickened action.
stimulus – Incentive.
stingy – Cheap, unwilling to spend money.
stipend – A definite amount paid at stated periods in compensation for services or as an allowance.
Stoicism – The principles or the practice of the Stoics-being very even tempered in success and failure.
stolid – Expressing no power of feeling or perceiving.
strait – A narrow passage of water connecting two larger bodies of water.
stratagem – Any clever trick or device for obtaining an advantage.
stratum – A natural or artificial layer, bed, or thickness of any substance or material.
streamlet – Rivulet.
stringency – Strictness.
stringent – Rigid.
stripling – A mere youth.
studious – Having or showing devotion to the acquisition of knowledge.
stultify – To give an appearance of foolishness to.
stupendous – Of prodigious size, bulk, or degree.
stupor – Profound lethargy.
suasion – The act of persuading.
suave – Smooth and pleasant in manner.
subacid – Somewhat sharp or biting.
subaquatic – Being, formed, or operating under water.
subconscious – Being or occurring in the mind, but without attendant consciousness or conscious perception.
subjacent – Situated directly underneath.
subjection – The act of bringing into a state of submission.
subjugate – To conquer.
subliminal – Being beneath the threshold of consciousness.
sublingual – Situated beneath the tongue.
submarine – Existing, done, or operating beneath the surface of the sea.
submerge – To place or plunge under water.
submergence – The act of submerging.
submersible – Capable of being put underwater.
submersion – The act of submerging.
submission – A yielding to the power or authority of another.
submittal – The act of submitting.
subordinate – Belonging to an inferior order in a classification.
subsequent – Following in time.
subservience – The quality, character, or condition of being servilely following another’s behests.
subservient – Servilely following another’s behests.
subside – To relapse into a state of repose and tranquility.
subsist – To be maintained or sustained.
subsistence – Sustenance.
substantive – Solid.
subtend – To extend opposite to.
subterfuge – Evasion.
subterranean – Situated or occurring below the surface of the earth.
subtle – Discriminating.
subtrahend – That which is to be subtracted.
subversion – An overthrow, as from the foundation.
subvert – To bring to ruin.
succeed – To accomplish what is attempted or intended.
success – A favorable or prosperous course or termination of anything attempted.
successful – Having reached a high degree of worldly prosperity.
successor – One who or that which takes the place of a predecessor or preceding thing.
succinct – Concise.
succulent – Juicy.
succumb – To cease to resist.
sufferance – Toleration.
sufficiency – An ample or adequate supply.
suffrage – The right or privilege of voting.
suffuse – To cover or fill the surface of.
suggestible – That can be suggested.
suggestive – Stimulating to thought or reflection.
summary – An abstract.
sumptuous – Rich and costly.
superabundance – An excessive amount.
superadd – To add in addition to what has been added.
superannuate – To become deteriorated or incapacitated by long service.
superb – Sumptuously elegant.
supercilious – Exhibiting haughty and careless contempt.
superficial – Knowing and understanding only the ordinary and the obvious.
superfluity – That part of anything that is in excess of what is needed.
superfluous – Being more than is needed.
superheat – To heat to excess.
superintend – To have the charge and direction of, especially of some work or movement.
superintendence – Direction and management.
superintendent – One who has the charge and direction of, especially of some work or movement.
superlative – That which is of the highest possible excellence or eminence.
supernatural – Caused miraculously or by the immediate exercise of divine power.
supernumerary – Superfluous.
supersede – To displace.
supine – Lying on the back.
supplant – To take the place of.
supple – Easily bent.
supplementary – Being an addition to.
supplicant – One who asks humbly and earnestly.
supplicate – To beg.
supposition – Conjecture.
suppress – To prevent from being disclosed or punished.
suppressible – Capable of being suppressed.
suppression – A forcible putting or keeping down.
supramundane – Supernatural.
surcharge – An additional amount charged.
surety – Security for payment or performance.
surfeit – To feed to fullness or to satiety.
surmise – To conjecture.
surmount – To overcome by force of will.
surreptitious – Clandestine.
surrogate – One who or that which is substituted for or appointed to act in place of another.
surround – To encircle.
surveyor – A land-measurer.
susceptibility – A specific capability of feeling or emotion.
susceptible – Easily under a specified power or influence.
suspense – Uncertainty.
suspension – A hanging from a support.
suspicious – Inclined to doubt or mistrust.
sustenance – Food.
swarthy – Having a dark hue, especially a dark or sunburned complexion.
Sybarite – A luxurious person.
sycophant – A servile flatterer, especially of those in authority or influence.
syllabic – Consisting of that which is uttered in a single vocal impulse.
syllabication – Division of words into that which is uttered in a single vocal impulse.
syllable – That which is uttered in a single vocal impulse.
syllabus – Outline of a subject, course, lecture, or treatise.
sylph – A slender, graceful young woman or girl.
symmetrical – Well-balanced.
symmetry – Relative proportion and harmony.
sympathetic – Having a fellow-feeling for or like feelings with another or others.
sympathize – To share the sentiments or mental states of another.
symphonic – Characterized by a harmonious or agreeable mingling of sounds.
symphonious – Marked by a harmonious or agreeable mingling of sounds.
symphony – A harmonious or agreeable mingling of sounds.
synchronism – Simultaneousness.
syndicate – An association of individuals united for the prosecution of some enterprise.
syneresis – The coalescence of two vowels or syllables, as e’er for ever.
synod – An ecclesiastical council.
synonym – A word having the same or almost the same meaning as some other.
synopsis – A syllabus or summary.
systematic – Methodical.