- Tenuity
- Term of office
- Termagant
- Termes bellicostus
- Terminational
- Terse
- Test
- Test case
- Test-furnace
- Testable
- Testator
- Testicles
- Testily
- Testimony
- Testosterone
- Testy
- Thanthra scholar
- Thantophobia
- That is
- That is it
- That is mercy
- That man
- That or this
- That witch joins
- Thatched fences
- The like of you
- The finer points of
- The first flight
- The first person
- The first world war
- The fish
- The flood
- The four freedoms
- The game is not worth the candle
- The gilt is off
- The good
- The maker
- The male of plants
- The middle of the eight directions of the compass
- The most high
- The new rich
- The nineties
- The object desired or longed for
- The prerils of
- The racing world
- The real thing
- The reverend gentleman
- The rights and wrongs
- The root of sweet-rush
- The rope
- The running
- The ultimate
- The unacceptable face of
- Theistically
- Thenceforward
- Theodolite
- Theodolitic
- Theological
- Theophanic
- Theophany
- Theoretician
- Theory
- Theosophic
- There is no saying
- Thermoluminiscent
- Thermometer
- Thermomter
- Thermonuclear
- Thermostat
- Thew
- They
- Thick end of the stick
- Thick skin
- Thickening
- Thickness of voice
- Thicko
- Thieve
- Thievery
- Thieves
- Thievish
- Thighless
- Thiswise
- Thither
- Thiyyas
- Tholas
- Thong
- Thorium
- Thoroughfare
- Thoroughness
- Those
- Thou
- Though
- Thoughtful
- Three times five
- Three-quarter
- Threefold
- Threesome
- Threnody
- Thriller
- Thrips