12 letters
- tetradrachms21
- tetragonally19
- tetrahedrite15
- tetrahedrons16
- tetrahymenas20
- tetrapyrrole18
- tetrazoliums26
- tetrodotoxin21
- theoretician18
- thermometers20
- thermometric23
- togetherness17
- trendsetters14
- trendsetting17
- trigonometry20
- trimethoprim23
- trimetrogons18
- turbidimeter20
- turbidimetry22
- typesettings20
- ultraviolets19
- unapologetic23
- unappetizing32
- underletting19
- undetectable22
- undetermined20
- unmarketable25
- unpretending22
- unreturnable20
- unrhetorical20
- unsettlement19
- unsettlingly21
- urethritises15
- urethroscope21
- valetudinary22
- vegetational20
- vegetatively25
- velocimeters23
- veterinarian18
- veterinaries17
- vinaigrettes19
- viscometries22
- viscosimeter22
- wastebaskets22
- wherethrough24
- whiffletrees24
- whippletrees24
- whitethroats19
- wretchedness22