| thickhead | (noun) Australian and southeastern Asian birds with a melodious whistling call | Synonyms: whistler |
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| thread | (noun) a fine cord of twisted fibers (of cotton or silk or wool or nylon etc.) used in sewing and weaving | Synonyms: yarn |
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| (noun) the raised helical rib going around a screw | Synonyms: screw thread |
| (noun) the connections that link the various parts of an event or argument together | Synonyms: train of thought |
| (noun) any long object resembling a thin line | Synonyms: ribbon |
| thunderhead | (noun) a rounded projecting mass of a cumulus cloud with shining edges; often appears before a thunderstorm | - |
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| towhead | (noun) a person with light blond hair | - |
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| trailhead | (noun) the beginning of a trail | Synonyms: trail head |
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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 | - |
| 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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| 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 |