15 letters
- ophthalmologist29
- overadvertising27
- overdiscounting28
- overembellished30
- overembellishes29
- paleobiologists25
- paleoecologists25
- paleomagnetisms28
- paleomagnetists25
- paleontologists23
- paleozoologists31
- pantheistically28
- pantisocratical26
- pantisocratists22
- parajournalisms33
- paralinguistics26
- parasitologists21
- parthenogenesis24
- particularising26
- particularistic26
- perfectionistic28
- perishabilities24
- permissibleness26
- pessimistically28
- pharisaicalness25
- pharmacologists29
- phenomenalistic29
- phenomenologist28
- philanthropists27
- photobiologists26
- photodissociate24
- photofinishings29
- photogeologists25
- photojournalism35
- photojournalist32
- photoperiodisms27
- physiotherapist27
- pluralistically28
- polymerisations25
- predispositions23
- preestablishing27
- preformationist25
- prehistorically27
- preregistration21
- prerevisionists23
- preservationist23
- professionalism26
- progressivistic27
- prohibitionists24
- proletarianised21
- proletarianises20
- promiscuousness27
- prosthodontists22
- protohistorians21
- protozoologists30
- pseudomorphisms31
- pseudoscientist24
- psychobiologist31
- psychohistorian28
- psychohistories27
- psycholinguists30
- psychophysicist35
- psychosynthesis30
- psychotherapist30
- punishabilities26
- quarterfinalist30
- radiobiologists22
- radiotherapists21
- reactionaryisms24
- recommissioning28
- reconnaissances24
- redistillations19
- redistributions21
- reestablishment25
- relinquishments33
- repristinations20
- repudiationists21
- requisitenesses26
- reregistrations18
- reservationists20
- resistibilities19
- resistivenesses20
- restrictionisms22
- restrictionists19
- resurrectionist20
- retransmissions20
- revisualization31
- revolutionising25
- rheumatologists24
- ritualistically24
- roentgenologist22
- sacramentalisms26
- sacramentalists23
- sadomasochistic27
- schistosomiases23
- schistosomiasis23
- schlockmeisters31
- schoolmasterish26
- sedimentologist23
- segregationists20
- semicolonialism27
- semisubmersible29
- sensationalised19
- sensationalises18
- sensationalisms21
- sensationalists18
- sentimentalised22
- sentimentalises21
- sentimentalisms24
- sentimentalists21
- servomechanisms31
- silviculturists26
- socialistically26
- sociobiologists24
- sociohistorical24
- sociolinguistic26
- solipsistically26
- sophisticatedly27
- sophistications24
- specialisations23
- spectroscopists27
- spermatogenesis24
- spinthariscopes27
- squeamishnesses31
- standoffishness26
- stereochemistry25
- stereoisomerism21
- steroidogenesis19
- strongyloidosis22
- supernaturalism25
- supernaturalist22
- superparasitism25
- superpatriotism25
- superspecialist26
- syllogistically28
- synchronisation25
- synergistically27
- tenosynovitises23
- territorialisms19
- territorialists16
- thermochemistry30
- thermoperiodism27
- thromboembolism33
- tightfistedness24
- toastmistresses18
- tomboyishnesses26
- totalitarianism20
- traditionalisms21
- traditionalists18
- transhistorical22
- transistorising19
- transistorizing28
- transmissometer22
- transsexualisms28
- trisoctahedrons22
- trypanosomiasis24
- ultraliberalism25
- ultramodernists22
- ultramontanisms25
- ultraprecisions24
- uncircumcisions31
- uncompromisable33
- undistinguished25
- unrealistically25
- unselfishnesses24
- unsophisticated26
- utilitarianisms21
- ventriloquistic34
- verisimilitudes25
- vicissitudinous26
- viscoelasticity28
- visionarinesses21
- vivisectionists27
- voyeuristically29
- wearisomenesses22
- westernisations20
- whistleblowings31
- worrisomenesses22