| A | B |
| Savant | person with knowledge |
| savor | To perceive by taste or smell. |
| scabbard | The sheath of a sword or similar bladed weapon. |
| Scale | to climb |
| Scapegoat | person on whom blame is placed for faults of others |
| scintilla | The faintest ray. |
| scribble | Hasty, careless writing. |
| Scrupulous | careful, diligent, painstaking |
| Scrutinize | examine carefully |
| Scuttle | sink |
| sedentary | not migratory; settled |
| sedulous | Persevering in effort or endeavor. |
| Seminary | an institution in which priests are trained |
| Sensuous | appealing to the senses |
| Sentinel | guard, sentry |
| sequence | The order in which a number or persons, things, or events follow one another in space or time. |
| Sequester | isolate |
| Serendipity | fortunate coincidence, unsought discovery |
| Serene | calm, peaceful |
| Serrated | jagged, saw-like |
| Servile | overly submissive, groveling |
| severance | Separation. |
| shrewd | Characterized by skill at understanding and profiting by circumstances. |
| sinecure | Any position having emoluments with few or no duties. |
| sinuous | Curving in and out. |
| Skeptical | doubting, not gullible |
| skiff | Usually, a small light boat propelled by oars. |
| Skirmish | minor battle |
| slander | false charges and malicious oral statements about someone |
| sluggard | sluggard: A person habitually lazy or idle; slow-moving, lethargic person |
| Smelt | refine an ore |
| Smorgasbord | a Swedish buffet of cold dishes |
| solace | Comfort in grief, trouble, or calamity. |
| Solicit | to ask for, seek |
| solvent | Having sufficient funds to pay all debts. |
| Somnambulist | sleepwalker |
| somniferous | Tending to produce sleep. |
| somnolent | Sleepy. |
| sonorous | Resonant. |
| Soothsayer | fortuneteller |
| sophistry | Reasoning sound in appearance only, especially when designedly deceptive. |
| Sophomoric | juvenile, immature |
| soporific | Causing sleep; also, something that causes sleep. |
| sordid | Filthy, morally degraded |
| Sparse | spare, bare, meager |
| specious | Plausible but False |
| Speckled | spotted, freckled, dotted |
| spontaneous | unplanned; naturally occurring |
| Sporadic | not continuous, intermittent |
| spurious | Not genuine; false |
| squalid | Having a dirty, mean, poverty-stricken appearance. |
| Stagnant | still, not moving |
| Staid | dull, sober, serious |
| stanch | To stop the flowing of; to check. |
| Stanza | section of a poem |
| Staunch | loyal, faithful, dependable |
| Stereotype | fixed image |
| Stevedore | dockworker |
| Stifle | suppress |
| stigma | A mark of infamy or token of disgrace attaching to a person as the result of evil-doing. |
| stingy | Cheap, unwilling to spend money. |
| Stoic | known for fortitude, indifferent to pleasure or pain |
| Stoke | add fuel to, strengthen |
| stolid | Expressing no power of feeling or perceiving; impassive, dull, indifferent |
| Stratagem | plot, plan, trick |
| Strident | loud and harsh |
| Stringent | strict or severe |
| Strut | swagger, show off |
| Stupefying | astonishing, shocking, stunning into silence |
| subdue | to restrain; to hold back |
| submerge | To place or plunge under water. |
| Subpoena | summons to court |
| Substantiate | give supporting evidence |
| substantiated | supported with proof or evidence; verified |
| subterfuge | Evasion; a trick |
| Subtle | not obvious |
| Subversive | rebellious, revolutionary |
| Succinct | concise |
| Suffragist | someone who campaigns for voting rights |
| sumptuous | Rich and costly. |