12 letters
- necromancies23
- necropolises20
- needlefishes20
- negativities19
- nematologies19
- neostigmines19
- nephelinites20
- nephrologies21
- nephrostomes21
- neuropathies19
- neutralities15
- newsweeklies24
- niacinamides21
- nightclothes23
- nightdresses18
- nightingales21
- nimblenesses21
- nitrogenases16
- nitrosamines17
- nomographies23
- nonchalances24
- noncountries19
- noncoverages23
- nondelegates18
- nonelectives22
- nonemployees23
- nonevidences23
- nonfeasances21
- nonfluencies23
- nongraduates18
- noninitiates15
- nonlanguages21
- nonlibraries18
- nonliterates15
- nonrelatives19
- nonresponses18
- nonreusables19
- nonsentences19
- nonsuccesses21
- nonutilities16
- nonviolences23
- notabilities17
- nucleophiles24
- numerologies20
- nuptialities18
- oafishnesses18
- oblatenesses17
- obstructives23
- obtusenesses17
- oceanologies19
- ochlocracies24
- octapeptides22
- odiousnesses15
- officialeses22
- offishnesses21
- oligochaetes20
- oligophagies22
- oligopsonies19
- omnipotences23
- omnisciences23
- opalescences23
- opaquenesses26
- optimalities19
- orchestrates17
- organicities18
- organologies18
- orientalizes23
- orismologies18
- ornatenesses14
- ornerinesses14
- oropharynges22
- oropharynxes27
- orotundities15
- orthogeneses17
- osmolalities17
- osmolarities16
- osteogeneses15
- osteopathies17
- osteoporoses15
- otiosenesses13
- otoscleroses16
- outdistances18
- outintrigues17
- outorganizes25
- outpopulates21
- outstretches18
- ovariotomies19
- overachieves25
- overanalyses20
- overanalyzes29
- overarranges19
- overbalances24
- overbleaches25
- overconsumes24
- overeducates21
- overemphases24
- overfatigues22
- overfocusses23
- overindulges22
- overinflates21
- overoperates19
- overpackages28
- overproduces24
- overpromises22
- overpromotes22
- overservices23
- overstresses16
- oversupplies24
- overutilizes27
- overvoltages23
- owlishnesses19
- oxalacetates23
- ozonospheres27
- paddlefishes23
- paedogeneses19
- paintbrushes22
- palingeneses20
- pallidnesses19
- paltrinesses17
- palynologies22
- paperinesses19
- papyrologies23
- paraldehydes22
- parametrizes27
- parfocalizes31
- partialities16
- participates21
- particulates20
- parvoviruses24
- patchinesses21
- pathogeneses20
- patriarchies20
- peakednesses21
- peccadilloes24
- pennycresses22
- pensionaries17
- pentamidines21
- pentathletes19
- pentazocines29
- pentlandites19
- perambulates23
- perchlorates21
- percipiences25
- peregrinates18
- performances25
- permanencies23
- perpetuities19
- perplexities26
- perseverates19
- persistences19
- personalises17
- personalizes26
- personalties17
- perspectives25
- pertinencies20
- perversities19
- petitenesses16
- petrogeneses18
- phagocytizes33
- phagocytoses24
- philhellenes23
- philosophies23
- phlebologies24
- phlebotomies24
- phosphatases22
- phosphatides23
- phosphatizes31
- phosphorites22
- phosphoruses23
- photoflashes23
- photoionizes27
- photokineses22
- photometries20
- photoreduces22
- photospheres22
- phrenologies21
- phycomycetes30
- phylacteries23
- phylloclades26
- phyllotaxies28
- physiologies22
- phytochromes27
- pickaninnies25
- pilocarpines23
- pitchblendes26
- placidnesses21
- plagioclases22
- plainclothes23
- planispheres22
- plantigrades20
- plasmogamies24
- plasticities19
- platyrrhines21
- pleasantries17
- pleiotropies19
- pliabilities20
- pliantnesses18
- pluckinesses25
- plushinesses20
- plutocracies23