15 letters
- transpirational21
- transplantation22
- transportations20
- transpositional21
- transvaluations23
- traumatizations29
- trivializations30
- ultrafastidious22
- ultrafiltration22
- ultraprecisions24
- unappreciations27
- unceremoniously28
- uncircumcisions31
- uncompassionate27
- unconditionally27
- unconsciousness26
- underestimation22
- underinflations24
- undernutritions21
- underproduction27
- undervaluations25
- unexceptionable35
- unexceptionably37
- unintentionally24
- unmelodiousness24
- unobjectionable37
- unpretentiously25
- unprofessionals25
- unquestioningly34
- unrevolutionary26
- unseriousnesses19
- untraditionally23
- vascularization34
- vasodilatations22
- veraciousnesses24
- vexatiousnesses28
- vicariousnesses24
- visionarinesses21
- vivaciousnesses28
- vivisectionists27
- volatilizations31
- voraciousnesses24
- weatherizations30
- westernisations20
- westernizations29
- xeroradiography32