15 letters
- prohibitionists24
- prohibitiveness28
- promotabilities25
- proportionality25
- provincialities27
- psychosexuality36
- pulchritudinous29
- punishabilities26
- pusillanimities25
- pyroelectricity29
- quadruplicities34
- radioactivities23
- reaccreditation23
- reasonabilities20
- recalcitrancies26
- recallabilities24
- recapitulations24
- recognizability36
- reconcilability29
- reconditenesses21
- reconstitutions21
- reeligibilities22
- reformabilities25
- refundabilities25
- rehabilitations22
- rehospitalizing33
- remediabilities23
- rememberability30
- repairabilities22
- repeatabilities22
- repetitiousness20
- replicabilities26
- reproducibility29
- requisitenesses26
- resectabilities22
- resistibilities19
- respiritualized30
- respiritualizes29
- retroactivities22
- retroperitoneal20
- reversibilities23
- revitalizations30
- ritualistically24
- sacrosanctities22
- saprogenicities24
- securitizations29
- seditiousnesses18
- semilogarithmic29
- semiterrestrial19
- semitranslucent25
- semitransparent23
- sensitivenesses21
- serendipitously24
- sidesplittingly26
- silversmithings28
- sinterabilities20
- solderabilities21
- solitudinarians20
- spiritualnesses21
- spreadabilities23
- squeezabilities38
- straitjacketing34
- straitlacedness21
- subreptitiously26
- substitutionary23
- superactivities26
- superfluidities25
- superhumanities26
- superimposition26
- supermajorities31
- supernutritions22
- superparasitism25
- superplasticity28
- superstitiously23
- suppressibility28
- surreptitiously23
- survivabilities28
- synchronicities27
- teletypewriters24
- tenosynovitises23
- territorialisms19
- territorialists16
- territorialized26
- territorializes25
- theatricalities21
- thermostability26
- thyrocalcitonin28
- totalitarianism20
- totalitarianize26
- traditionalisms21
- traditionalists18
- traditionalized28
- traditionalizes27
- transferability25
- translatability23
- transliterating20
- transliteration18
- transpositional21
- triangularities20
- trinitrotoluene19
- ultimogenitures24
- ultravirilities22
- unacceptability32
- unanswerability27
- unassailability24
- unchangeability31
- unconditionally27
- underactivities25
- undernutritions21
- unemployability32
- unfamiliarities24
- uniformitarians24
- uninhibitedness25
- unknowabilities29
- unmitigatedness24
- unpunctualities27
- unreliabilities22
- unsociabilities24
- unsuitabilities22
- untraditionally23
- unworkabilities28
- upgradabilities26
- utilitarianisms21
- verifiabilities26
- verisimilitudes25
- veritablenesses24
- vicissitudinous26
- viscoelasticity28
- vulnerabilities26
- whatchamacallit33
- withdrawnnesses26