14 letters
- papilionaceous26
- papillomavirus30
- parenchymatous29
- parsimoniously25
- percussionists22
- percussiveness26
- percutaneously26
- perfidiousness23
- perilousnesses20
- peritrichously26
- perniciousness23
- pertinaciously25
- perviousnesses23
- philadelphuses28
- picornaviruses26
- plausibilities23
- polymorphously32
- populousnesses24
- portentousness20
- posthumousness25
- postindustrial21
- postmenopausal26
- precariousness22
- preciousnesses22
- precociousness25
- precombustions28
- preconsciouses25
- preconsciously28
- predaceousness23
- preposterously24
- presumptuously29
- previousnesses23
- prodigiousness22
- propitiousness22
- prosperousness22
- protrusiveness23
- proventriculus28
- pseudomorphous28
- pseudonymously29
- psychoacoustic31
- pugnaciousness26
- rambunctiously29
- rampageousness24
- ravenousnesses21
- rebelliousness21
- resuscitations19
- ridiculousness22
- rigorousnesses18
- robustiousness20
- sacrilegiously24
- salubriousness21
- scabrousnesses22
- scandalousness22
- scrupulousness25
- scurrilousness21
- sedulousnesses19
- semiautonomous23
- sensuousnesses18
- simultaneously24
- slanderousness19
- slaughterhouse23
- slaughterously24
- socioreligious21
- solicitousness20
- sonorousnesses17
- spaciousnesses22
- speciousnesses22
- spuriousnesses20
- staphylococcus32
- studiousnesses18
- stupendousness22
- subconsciouses26
- subconsciously29
- subcutaneously27
- superambitious25
- superciliously26
- superluxurious29
- supposititious22
- susceptibility27
- susceptiveness26
- susceptivities25
- suspiciousness23
- sustainability22
- timorousnesses19
- toothbrushings25
- tortuousnesses17
- transcutaneous21
- tremendousness21
- trichotomously26
- trustabilities19
- trustfulnesses21
- trustingnesses19
- tsutsugamushis24
- tumultuousness23
- ubiquitousness30
- ultraexclusive32
- ultraglamorous23
- ultrahazardous29
- umbrageousness25
- unaccustomedly30
- unbusinesslike26
- unchivalrously30
- unctuousnesses22
- underthrusting23
- unenthusiastic23
- ungraciousness23
- unostentatious18
- unscrupulously29
- unsuspectingly29
- uproariousness20
- usufructuaries24
- usuriousnesses18
- uxoriousnesses24
- vaingloriously26
- vaporousnesses23
- venomousnesses24
- victoriousness23
- vigorousnesses22
- villainousness23
- virtuousnesses21
- vociferousness26
- voluminousness26
- voluptuousness26
- wondrousnesses21