11 letters
- interstrand14
- intervenors17
- intonations14
- intravenous18
- introspects18
- invaginates19
- invariances20
- inventorial18
- inventories17
- invigorates18
- invigorator18
- invitations17
- invocations20
- ironmasters15
- irrationals13
- irritations12
- isoantigens15
- italianates13
- itineration13
- levitations17
- lipoprotein19
- lipotropins19
- literations13
- lovastatins17
- maintainers16
- marinations16
- ministrants16
- monetarists15
- motivations19
- narrational14
- nationalise14
- nationalist14
- natriuresis13
- navigations19
- negativists18
- negotiation15
- negotiators14
- nervosities16
- neurosporas16
- nitrosamine16
- nominatives20
- nonabrasive20
- nonadaptive21
- nonartistic16
- nonaspirins17
- nonirritant14
- nonoperatic19
- nonpartisan17
- nonreactors16
- nonstarters13
- nonsteroids14
- nonsupports20
- notorieties12
- observation19
- omnipotents19
- operational16
- opinionated17
- opportunist19
- oppositions18
- oppressions18
- ordinariest13
- ordinations14
- orientalist13
- orientating15
- orientation13
- originators14
- ornithopter17
- orthoepists16
- orthopteran17
- ostentation13
- overactions19
- overpassing21
- overpraises18
- overstating18
- overstories15
- overstrains16
- overtipping24
- overtopping24
- ovipositors18
- paginations18
- palatinates16
- palpitation19
- pancreatins19
- papaverines22
- paramnesias18
- paraphrases19
- parasitised15
- parasitises14
- parasitizes23
- parasitoids15
- parasitoses14
- parasitosis14
- paratrooper17
- parishioner17
- paronomasia18
- parotitises14
- parsimonies18
- participant21
- participate20
- partitioned16
- partitioner15
- partnership20
- parturients16
- parturition16
- passivating21
- passivation19
- pastoralist15
- paternalist16
- paternities15
- paternoster15
- patinations16
- patriciates17
- patrimonies18
- patriotisms17
- patronising18
- patternings18
- peasantries15
- pectination19
- pediatrists15
- penetration16
- perforation18
- periostitis14
- periphrasis19
- peritonitis15
- perorations15
- personalist16
- personating18
- personation16
- personative19
- personators15
- perversions19
- petitionary17
- petitioners15
- photoresist16
- pianofortes18
- pinspotters18
- planarities16
- plantations17
- podiatrists15
- poinsettias15
- pomposities20
- portamentos18
- portionless16
- portraitist14
- posterities14
- postharvest20
- posttension16
- potentiator15
- praetorians15
- praetorship19
- precipitant21
- preinvasion20
- premonition19
- preparation18
- preparative21
- preparators17
- preportions18
- preposition18
- prepositive21
- preprinting21
- pretensions16
- pretraining18
- preventions20
- previsional20
- privateness19
- probationer18
- procreation18
- profanation19
- profanities18
- progenitors17
- progression17
- proletarian16
- proletariat15
- propagation20
- propagative23
- propagators19
- propionates18
- propitiated18
- propitiates17
- propitiator17
- proportions18
- proposition18
- propraetors17
- proprieties17
- proprietors17
- proseminars18
- prospectors20
- prostatitis14
- prostrating17
- prostration15
- protagonist17
- protections18
- proteinases15
- proteinuria16
- protestants15
- protonating18
- protonation16
- protonemata18
- protoplanet19
- protoplasts18