16 letters
- thrombophlebitis33
- tintinnabulation25
- traditionalistic22
- traditionalizing31
- trafficabilities29
- transcontinental24
- transcriptionist24
- transfigurations24
- transformational25
- transitivenesses22
- transliterations19
- transmissivities24
- transnationalism23
- transparentizing33
- transplantations23
- transportational22
- transsexualities26
- transubstantiate22
- tumorigenicities26
- ultrafiltrations23
- ultranationalism24
- ultranationalist21
- unaffectionately31
- unalterabilities23
- unapologetically31
- unattractiveness26
- unavailabilities27
- uncharacteristic29
- uncongenialities26
- unconstitutional25
- unconventionally32
- undecidabilities27
- undemocratically32
- undenominational26
- underestimations23
- underproductions28
- underutilization31
- undesirabilities23
- undifferentiated27
- undiplomatically33
- undiscriminating29
- unflappabilities32
- ungrammaticality32
- unidirectionally27
- universalization33
- unostentatiously23
- unpalatabilities26
- unrepresentative26
- unsatisfactorily27
- unscientifically32
- unsophistication27
- unsubstantiality26
- unsystematically30
- unthinkabilities29
- untouchabilities28
- upgradeabilities27
- vascularizations35
- vasoconstriction28
- vasoconstrictive31
- vegetativenesses27
- vindictivenesses30
- vulvovaginitides34
- watertightnesses24
- weatherabilities25