- Thirty Adj Noun Num
- Thirty-fifth Num Noun
- Thirty-first Num Noun
- Thirty-one Num Noun
- Thirty-second Num Noun
- Thirty-seven Adj Noun Num
- Thirty-sixth Num Noun
- Thirty-year-old Adj Noun
- Thisness Noun
- Thistle Noun Adj
- Thixotropy Noun
- Thole Noun Verb
- Tholepin Noun Adj
- Tholobate Noun
- Tholos Noun Adj
- Tholus Noun
- Thomas Noun Pnoun
- Thompson Noun Pnoun Adj
- Thomsen Noun Pnoun Adj
- Thomsenolite Noun Adj
- Thomsonite Noun Adj
- Thong Noun Verb Adj
- Thonging Noun Adj
- Thor Noun Pnoun
- Thoracentesis Noun
- Thoracocentesis Noun
- Thoracodidymus Noun Adj
- Thoracoepigastric Adj Noun
- Thoracolaparotomy Noun Adj
- Thoracolysis Noun
- Thoracopagus Noun Adj
- Thoracoplasty Noun Adj
- Thoracoscopy Noun
- Thoracotomy Noun Adj
- Thorax Noun Adj
- Thoria Noun Adj
- Thorianite Noun Adj
- Thorite Noun Adj
- Thorium Noun Adj
- Thorn Noun Verb
- Thornback Noun Adj
- Thornbush Noun Adj
- Thorniness Noun
- Thorning Noun Pres. Participle
- Thornshaven Noun Pnoun
- Thorogummite Noun Adj
- Thoroughbass Noun Adj
- Thoroughbred Adj Noun
- Thoroughfare Noun
- Thoroughgoingness Noun
- Thoroughness Noun
- Thoroughwax Noun Adj
- Thoroughwort Noun Adj
- Thorp Noun
- Thorpe Noun
- Thorshavn Noun Pnoun Adj
- Thot Noun Adj
- Thought Noun Adj
- Thoughtfulness Noun
- Thoughtlessness Noun