11 letters
- interchange20
- intercooler16
- intercostal16
- intercouple20
- intercrater15
- interdealer14
- intergrowth19
- interjector24
- interlopers16
- interpolate16
- interpreted16
- interpreter15
- interrelate13
- interrogate14
- interrogees14
- interrupter16
- interruptor16
- interschool18
- intolerance17
- intrathecal18
- ironhearted15
- irrelevance20
- kinetochore21
- latchstring20
- leatherneck22
- letterspace18
- lionhearted16
- logographic24
- luteotropic19
- luteotropin17
- lycanthrope23
- mantelpiece22
- melanophore21
- metagenetic20
- metanephric23
- metanephroi20
- monographic25
- moonlighter20
- morphogenic25
- narcoleptic22
- necrologies18
- necrologist18
- necrophilia21
- necropoleis19
- negotiators14
- negotiatory16
- negrophobia22
- neocortical19
- nephrotoxic27
- neuroleptic20
- neuropathic21
- neurotropic19
- nomographic25
- nonathletic19
- nonliterate14
- nonoperatic19
- nontropical20
- northeaster14
- northerlies15
- obliterator15
- oligochaete19
- ontogenetic18
- openhearted18
- operational16
- orchestrate16
- ornithopter17
- orographies18
- orthocenter17
- orthopaedic20
- orthopteran17
- osteopathic19
- outcapering21
- outcheating20
- outreaching20
- overarching23
- overheaping23
- overhearing20
- overheating20
- overleaping22
- overletting19
- overnighter20
- overoperate18
- overprotect21
- overreacher20
- overtighten20
- pacesetting20
- paragenetic20
- parenthetic20
- paresthetic19
- partitioner15
- paternoster15
- pathologies19
- pathologist19
- pearlescent19
- pedogenetic21
- penetrating18
- penetration16
- penetrative19
- penological22
- pentarchies20
- pentathlete18
- percentages20
- percentiles19
- perchlorate20
- percolating21
- percolation19
- percolators18
- peregrinate17
- perforating20
- perforation18
- periodontal17
- perithecial20
- perorations15
- perpetrator17
- petrologies17
- petrologist17
- phenologies20
- philanderer19
- phonogramic25
- phonotactic23
- photometric22
- pigeonholed21
- pigeonholer20
- pigeonholes20
- planchettes21
- platyrrhine20
- plecopteran22
- polarimeter18
- poltergeist17
- polygenetic23
- portraiture15
- potentiator15
- potlatching23
- potteringly20
- praelecting21
- pratincoles19
- preachingly25
- preaverring21
- precleaning22
- preclearing21
- precolonial20
- precreasing20
- predoctoral19
- preelecting21
- preelection19
- preelectric21
- preenacting21
- preerecting20
- prehearings19
- prelections19
- preliterary17
- preliterate15
- preordering18
- preregister16
- prerogative20
- preromantic21
- preschooler20
- preterminal19
- pretreating17
- probationer18
- procreating20
- procreation18
- procreative21
- procreators17
- procuration19
- profiterole18
- progenitors17
- prolegomena21
- proletarian16
- proletariat15
- proliferate18
- prophetical23
- prorogating19
- prorogation17
- prostrating17
- prostration15
- protagonist17
- protections18
- protectoral18
- proteolytic20
- prothoraces19
- prothoracic22
- protocoling21
- protonating18
- protopathic22
- protoplanet19
- protostelic18
- protractile18
- protracting20
- protraction18
- protractive21
- protractors17
- reaccepting23
- reallotting16
- reapportion18
- rearresting14
- reattaching19
- recapturing21
- recarpeting20
- rechallenge21