| schoolteacher | (noun) a teacher in a school below the college level | Synonyms: school teacher |
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| selachian | (noun) any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks, rays, skates | Synonyms: elasmobranch |
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| slowcoach | (noun) someone who moves slowly | Synonyms: plodder, slowpoke, stick-in-the-mud |
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| soutache | (noun) a narrow braid used as a decorative trimming | - |
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| spinach | (noun) dark green leaves; eaten cooked or raw in salads | - |
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| (noun) southwestern Asian plant widely cultivated for its succulent edible dark green leaves | Synonyms: prickly-seeded spinach, spinach plant, Spinacia oleracea |
| sprachgefuhl | (noun) an intuitive feeling for the natural idiom of a language | - |
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| stachyose | (noun) a tetrasaccharide found in the tubers of the Chinese artichoke | - |
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| stagecoach | (noun) a large coach-and-four formerly used to carry passengers and mail on regular routes between towns | Synonyms: stage |
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| stomach | (noun) an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion | Synonyms: breadbasket, tum, tummy |
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| (noun) the region of the body of a vertebrate between the thorax and the pelvis | Synonyms: abdomen, belly, venter |
| (noun) an appetite for food | - |
| (noun) an inclination or liking for things involving conflict or difficulty or unpleasantness | - |
| stomachache | (noun) an ache localized in the stomach or abdominal region | Synonyms: bellyache, gastralgia, stomach ache |
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| stomacher | (noun) garment consisting of a V-shaped panel of stiff material worn over the chest and stomach in the 16th century | - |
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| sumach | (noun) a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus) | Synonyms: shumac, sumac |
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| symmachy | (noun) Fighting together or in an alliance with an ally (or allies) | - |
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| tach | (noun) measuring instrument for indicating speed of rotation | Synonyms: tachometer |
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| tacheometer | (noun) a theodolite designed for rapid measurements | Synonyms: tachymeter |
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| tachistoscope | (noun) scientific instrument used by psychologists; presents visual stimuli for brief exposures | Synonyms: t-scope |
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| tachogram | (noun) a graphical record of speed and distance produced by a tachograph | - |
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| tachograph | (noun) a tachometer that produces a graphical record of its readings; used to record the speed and duration of trips in a motor vehicle | - |
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| tachometer | (noun) measuring instrument for indicating speed of rotation | Synonyms: tach |
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| tachycardia | (noun) abnormally rapid heartbeat (over 100 beats per minute) | - |
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| tachygraphy | (noun) a method of writing rapidly using an abbreviated symbolic system | Synonyms: shorthand, stenography |
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| tachylite | (noun) a basic or basalt glass | - |
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| tachymeter | (noun) a theodolite designed for rapid measurements | Synonyms: tacheometer |
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| taoiseach | (noun) the prime minister of the Irish Republic | - |
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| tauromachy | (noun) the activity at a bullfight | Synonyms: bullfighting |
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| teacher | (noun) a personified abstraction that teaches | - |
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| (noun) a person whose occupation is teaching | Synonyms: instructor |
| teachership | (noun) the position of teacher | - |
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| teaching | (noun) the profession of a teacher | Synonyms: instruction, pedagogy |
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| (noun) the activities of educating or instructing; activities that impart knowledge or skill | Synonyms: didactics, education, educational activity, instruction, pedagogy |
| (noun) a doctrine that is taught | Synonyms: commandment, precept |
| tetrachlorethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachloroethylene |
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| tetrachloride | (noun) any compound that contains four chlorine atoms per molecule | - |
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| tetrachloroethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachlorethylene |
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| tetrachloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, perchloromethane |
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| toothache | (noun) an ache localized in or around a tooth | Synonyms: odontalgia |
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| trachea | (noun) membranous tube with cartilaginous rings that conveys inhaled air from the larynx to the bronchi | Synonyms: windpipe |
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| (noun) one of the tubules forming the respiratory system of most insects and many arachnids | - |
| tracheid | (noun) long tubular cell peculiar to xylem | - |
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| tracheitis | (noun) inflammation of the trachea | - |
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| tracheobronchitis | (noun) common respiratory infection characterized by inflammation of the trachea and the bronchi | - |
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| tracheophyte | (noun) green plant having a vascular system: ferns, gymnosperms, angiosperms | Synonyms: vascular plant |
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| tracheostomy | (noun) a surgical operation that creates an opening into the trachea with a tube inserted to provide a passage for air; performed when the pharynx is obstructed by edema or cancer or other causes | Synonyms: tracheotomy |
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| tracheotomy | (noun) a surgical operation that creates an opening into the trachea with a tube inserted to provide a passage for air; performed when the pharynx is obstructed by edema or cancer or other causes | Synonyms: tracheostomy |
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| trachodon | (noun) large duck-billed dinosaur of the Cretaceous period | Synonyms: trachodont |
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| trachodont | (noun) large duck-billed dinosaur of the Cretaceous period | Synonyms: trachodon |
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| trachoma | (noun) a chronic contagious disease caused by a bacterium and marked by inflammation of the conjunctiva and cornea of the eye and the formation of scar tissue | - |
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| treacherousness | (noun) The characteristic of providing insecure footing or support; of being marked by hidden dangers, hazards, or perils. | - |
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| treachery | (noun) an act of deliberate betrayal | Synonyms: betrayal, perfidy, treason |
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| (noun) betrayal of a trust | Synonyms: perfidiousness, perfidy |
| unapproachability | (noun) a disposition to be unapproachable; unfriendly and inaccessible | - |
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| underachievement | (noun) poorer than expected performance (poorer than might have been predicted from intelligence tests) | - |
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| underachiever | (noun) a student who does not perform as well as expected or as well as the IQ indicates | Synonyms: nonachiever, underperformer |
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| viscacha | (noun) gregarious burrowing rodent larger than the chinchillas | Synonyms: chinchillon, Lagostomus maximus |
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| yacht | (noun) an expensive vessel propelled by sail or power and used for cruising or racing | Synonyms: racing yacht |
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| yachting | (noun) water travel for pleasure | Synonyms: boating |
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| yachtsman | (noun) a male person who owns or sails a yacht | - |
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| yachtsperson | (noun) a person who owns or sails a yacht | - |
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| yachtswoman | (noun) a female person who owns or sails a yacht | - |
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