13 letters
- operationally21
- ophthalmology29
- optionalities18
- orgiastically22
- orientalizing27
- orientational16
- originalities17
- orismological23
- oropharyngeal24
- orthoepically25
- orthogonality21
- orthogonalize28
- oscillational20
- osteomalacias20
- outgeneraling21
- overanalyzing33
- overbalancing28
- overemotional22
- overidealized29
- overidealizes28
- overpedalling26
- overqualified32
- overtalkative26
- overvaluation24
- overzealously31
- ovipositional22
- oxaloacetates24
- palatableness22
- paleobiologic26
- paleobotanies21
- paleobotanist21
- paleoecologic26
- paleographers24
- paleographies24
- paleomagnetic26
- paleontologic24
- palindromists22
- palletization28
- palpabilities24
- palynological27
- palynologists23
- panegyrically28
- panoramically27
- pantheistical23
- parabolically27
- paradoxically31
- paralanguages23
- parallelogram24
- paralytically26
- paralyzations29
- paranormality23
- paraphernalia23
- parasexuality27
- parasitically23
- parasiticidal21
- parenthetical23
- parfocalities23
- parfocalizing35
- parochialisms25
- participially26
- paternalistic21
- patriotically23
- pedagogically28
- penalizations28
- penitentially22
- pentobarbital24
- periodontally22
- permutational22
- personalising21
- personalistic21
- personalities18
- personalizing30
- petrochemical28
- phalansteries20
- phallocentric27
- pharisaically25
- pharmacopeial28
- phenobarbital26
- phenomenalism27
- phenomenalist24
- phenylalanine25
- philosophical28
- photochemical30
- phrenological26
- physicalistic27
- physicalities24
- physiological27
- phytochemical32
- pianistically24
- pictorialisms23
- pictorialists20
- pictorialized30
- pictorializes29
- pictorialness21
- pietistically23
- planetesimals22
- pluralization29
- pneumatically28
- politicalized31
- politicalizes30
- polyribosomal26
- postclassical24
- postcranially24
- postembryonal26
- postinaugural22
- postulational20
- practicalness24
- pragmatically28
- pralltrillers20
- praxeological30
- prebiological26
- precalculuses26
- precapitalist23
- preceptorials23
- prehistorical22
- preindustrial20
- prejudicially34
- premenopausal25
- premillennial24
- prepositional21
- prequalifying35
- presbyterials22
- preternatural19
- prevocational25
- principalship29
- prismatically26
- probationally24
- problematical27
- procathedrals23
- processionals21
- proctological26
- procuratorial21
- prodigalities20
- professionals21
- progressional20
- proleptically27
- prophetically28
- proportionals21
- propositional21
- proprietorial20
- prosecutorial21
- prosencephala26
- protogalaxies26
- provincialism28
- provincialist25
- provinciality27
- provincialize34
- provisionally25
- psephological28
- pseudoalleles21
- psychoanalyst27
- psychoanalyze36
- psychological30
- psychotically30
- punctualities23
- puritanically25
- pyrolytically28
- pyrotechnical28
- quadratically31
- quadrennially30
- quadrilateral26
- quadrivalents30
- qualification31
- qualitatively31
- quarterfinals28
- quasicrystals29
- quinquennials37
- radicalnesses19
- radiochemical26
- rarefactional21
- rationalising18
- rationalistic18
- rationalities15
- rationalizers24
- rationalizing27
- realistically21
- reallocations19
- recalcitrance24
- recalcitrancy26
- recalcitrants21
- recalculating25
- recalculation23
- recalibrating23
- recalibration21
- recallability24
- recapitalized30
- recapitalizes29
- rechallenging26
- recrystallize29
- reescalations18
- reevaluations20
- referentially21
- reformational21
- regionalistic20
- regionalizing29
- rehospitalize28
- rematerialize26
- renationalize25
- renormalizing30
- reportorially20