| trailhead | (noun) the beginning of a trail | Synonyms: trail head |
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| trainload | (noun) quantity that can be carried by a train | - |
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| tread | (noun) a step in walking or running | Synonyms: pace, stride |
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| (noun) structural member consisting of the horizontal part of a stair or step | - |
| (noun) the part (as of a wheel or shoe) that makes contact with the ground | - |
| (noun) the grooved surface of a pneumatic tire | - |
| triad | (noun) a three-note major or minor chord; a note and its third and fifth tones | Synonyms: common chord |
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| (noun) three people considered as a unit | Synonyms: threesome, trinity, trio |
| (noun) a set of three similar things considered as a unit | Synonyms: trio, triple, triplet |
| (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, trine, trinity, trio, triplet, troika |
| trichomonad | (noun) cause of trichomoniasis in women and cattle and birds | - |
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| turtlehead | (noun) showy perennial of marshlands of eastern and central North America having waxy lanceolate leaves and flower with lower part creamy white and upper parts pale pink to deep purple | Synonyms: Chelone glabra, shell-flower, shellflower, snake-head, snakehead |
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| undergrad | (noun) a university student who has not yet received a first degree | Synonyms: undergraduate |
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| wad | (noun) a wad of something chewable as tobacco | Synonyms: chaw, chew, cud, plug, quid |
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| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum |
| (noun) a small mass of soft material | - |
| warhead | (noun) the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents | Synonyms: load, payload |
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| wellhead | (noun) a structure built over a well | - |
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| (noun) the source of water for a well | Synonyms: wellspring |
| whitehead | (noun) a small whitish lump in the skin due to a clogged sebaceous gland | Synonyms: milium |
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| wingspread | (noun) distance between the tips of the wings (as of a bird or insect) when fully extended | - |
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| (noun) linear distance between the extremities of an airfoil | Synonyms: wingspan |
| woad | (noun) any of several herbs of the genus Isatis | - |
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| (noun) a blue dyestuff obtained from the woad plant | - |
| workload | (noun) work that a person is expected to do in a specified time | Synonyms: work load |
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| xanthomonad | (noun) bacteria producing yellow non-water-soluble pigments; some pathogenic for plants | - |
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