| silvex | (noun) a herbicide that is effective in controlling woody plants but is toxic to animals | - |
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| simplex | (adjective) having only one part or element | - |
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| (adjective) allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time | - |
| six | (adjective) denoting a quantity consisting of six items or units | Synonyms: 6, half-dozen, half dozen, vi |
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| (noun) a playing card or domino or die whose upward face shows six pips | Synonyms: six-spot |
| (noun) the cardinal number that is the sum of five and one | Synonyms: 6, Captain Hicks, half a dozen, hexad, sestet, sextet, sextuplet, sise, sixer, VI |
| skybox | (noun) an elevated box for viewing events at a sports stadium | - |
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| smallpox | (noun) a highly contagious viral disease characterized by fever and weakness and skin eruption with pustules that form scabs that slough off leaving scars | Synonyms: variola, variola major |
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| smilax | (noun) fragile twining plant of South Africa with bright green flattened stems and glossy foliage popular as a floral decoration | Synonyms: Asparagus asparagoides |
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| snuffbox | (noun) a small ornamental box for carrying snuff in your pocket | - |
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| soapbox | (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: ambo, dais, podium, pulpit, rostrum, stump |
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| (noun) a crate for packing soap | - |
| soundbox | (noun) a resonating chamber in a musical instrument (as the body of a violin) | Synonyms: body |
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| spadix | (noun) the fleshy axis of a spike often surrounded by a spathe | - |
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| spandex | (noun) an elastic synthetic fabric | - |
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| sphinx | (noun) one of a number of large stone statues with the body of a lion and the head of a man that were built by the ancient Egyptians | - |
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| (noun) an inscrutable person who keeps his thoughts and intentions secret | - |
| storax | (noun) a vanilla-scented resin from various trees of the genus Styrax | - |
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| strongbox | (noun) a strongly made box for holding money or valuables; can be locked | Synonyms: deedbox |
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| styrax | (noun) any shrub or small tree of the genus Styrax having fragrant bell-shaped flowers that hang below the dark green foliage | - |
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| suffix | (noun) an affix that is added at the end of the word | Synonyms: postfix |
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| (verb) attach a suffix to | - |
| suffrutex | (noun) low-growing woody shrub or perennial with woody base | Synonyms: subshrub |
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| supertax | (noun) an additional tax on certain kinds of income that has already been taxed | Synonyms: surtax |
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| surtax | (noun) an additional tax on certain kinds of income that has already been taxed | Synonyms: supertax |
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| (verb) levy an extra tax on | - |
| sweatbox | (noun) a device that causes tobacco leaves or fruit or hides to sweat | - |
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| (noun) small or narrow cell | - |
| syntax | (noun) studies of the rules for forming admissible sentences | - |
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| (noun) the grammatical arrangement of words in sentences | Synonyms: phrase structure, sentence structure |
| (noun) a systematic orderly arrangement | - |
| syrinx | (noun) the vocal organ of a bird | - |
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| (noun) a primitive wind instrument consisting of several parallel pipes bound together | Synonyms: pandean pipe, panpipe |
| tax | (noun) charge against a citizen's person or property or activity for the support of government | Synonyms: revenue enhancement, taxation |
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| (verb) make a charge against or accuse | - |
| (verb) use to the limit | Synonyms: task |
| (verb) levy a tax on | - |
| (verb) set or determine the amount of (a payment such as a fine) | Synonyms: assess |
| telefax | (verb) send something via a facsimile machine | Synonyms: facsimile, fax |
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| telex | (noun) a character printer connected to a telegraph that operates like a typewriter | Synonyms: teleprinter, teletype machine, teletypewriter, telex machine |
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| (verb) communicate by telex | - |
| testatrix | (noun) a female testator | - |
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| thorax | (noun) part of an insect's body that bears the wings and legs | - |
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| (noun) the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates | Synonyms: chest, pectus |
| (noun) the middle region of the body of an arthropod between the head and the abdomen | - |
| tinderbox | (noun) a box for holding tinder | - |
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| (noun) a dangerous state of affairs; a situation that is a potential source of violence | - |
| toadflax | (noun) common European perennial having showy yellow and orange flowers; a naturalized weed in North America | Synonyms: butter-and-eggs, devil's flax, Linaria vulgaris, wild snapdragon |
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| toolbox | (noun) a box or chest or cabinet for holding hand tools | Synonyms: tool cabinet, tool case, tool chest |
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| tortrix | (noun) small Indian moth infesting e.g. tea and coffee plants | Synonyms: Homona coffearia, tea tortrix |
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| (noun) California moth whose larvae live in especially oranges | Synonyms: Argyrotaenia citrana, orange tortrix |
| transfix | (verb) pierce with a sharp stake or point | Synonyms: empale, impale, spike |
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| (verb) to render motionless, as with a fixed stare or by arousing terror or awe | Synonyms: fascinate, grip, spellbind |
| triplex | (adjective) having three units or components or elements | Synonyms: ternary, treble, triple |
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| tux | (noun) semiformal evening dress for men | Synonyms: black tie, dinner jacket, tuxedo |
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| unbox | (verb) remove from a box | - |
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| (verb) to open a new product on a video stream | - |
| unisex | (adjective) not distinguished on the basis of sex | - |
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| unlax | (verb) cause to feel relaxed | Synonyms: loosen up, make relaxed, relax, unstrain, unwind |
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| unorthodox | (adjective) breaking with convention or tradition | - |
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| (adjective) independent in behavior or thought | Synonyms: irregular, maverick |
| unsex | (verb) make infertile | Synonyms: desex, desexualise, desexualize, fix, sterilise, sterilize |
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| (verb) remove the qualities typical of one's sex | - |
| (verb) deprive of sex or sexual powers | - |
| varix | (noun) abnormally enlarged or twisted blood vessel or lymphatic vessel | - |
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| vernix | (noun) a white cheeselike protective material that covers the skin of a fetus | Synonyms: vernix caseosa |
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| vertex | (noun) the point of intersection of lines or the point opposite the base of a figure | - |
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| (noun) the highest point (of something) | Synonyms: acme, apex, peak |
| vex | (verb) be a mystery or bewildering to | Synonyms: amaze, baffle, beat, bewilder, dumbfound, flummox, get, gravel, mystify, nonplus, perplex, pose, puzzle, stick, stupefy |
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| (verb) subject to prolonged examination, discussion, or deliberation | - |
| (verb) change the arrangement or position of | Synonyms: agitate, commove, disturb, raise up, shake up, stir up |
| (verb) cause annoyance in; disturb, especially by minor irritations | Synonyms: annoy, bother, chafe, devil, get at, get to, gravel, irritate, nark, nettle, rag, rile |
| (verb) disturb the peace of mind of; afflict with mental agitation or distress | Synonyms: worry |
| vortex | (noun) a powerful circular current of water (usually the result of conflicting tides) | Synonyms: maelstrom, whirlpool |
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| (noun) the shape of something rotating rapidly | Synonyms: convolution, swirl, whirl |
| vox | (noun) the sound made by the vibration of vocal folds modified by the resonance of the vocal tract | Synonyms: phonation, vocalisation, vocalism, vocalization, voice |
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| wax | (noun) any of various substances of either mineral origin or plant or animal origin; they are solid at normal temperatures and insoluble in water | - |
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| (verb) go up or advance | Synonyms: climb, mount, rise |
| (verb) increase in phase | Synonyms: full |
| (verb) cover with wax | - |
| workbox | (noun) container for holding implements and materials for work (especially for sewing) | Synonyms: workbag, workbasket |
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| x | (adjective) being one more than nine | Synonyms: 10, ten |
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| (noun) the 24th letter of the Roman alphabet | Synonyms: ex, X |
| xerox | (noun) a copy made by a xerographic copier | Synonyms: xerox copy |
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| (verb) reproduce by xerography | Synonyms: photocopy, run off |
| xix | (adjective) being one more than eighteen | Synonyms: 19, nineteen |
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| xx | (adjective) denoting a quantity consisting of 20 items or units | Synonyms: 20, twenty |
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| xxix | (adjective) being nine more than twenty | Synonyms: 29, twenty-nine |
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| xxx | (adjective) being ten more than twenty | Synonyms: 30, thirty |
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