11 letters
- outcrossing18
- outgrossing17
- overdosages18
- overexposed26
- overexposes25
- ovipositing21
- oviposition19
- ovipositors18
- ozonosphere26
- parasitoses14
- parasitosis14
- paternoster15
- peccadillos23
- pediculoses20
- pediculosis20
- pelycosaurs21
- periostitis14
- permafrosts20
- phagocytose23
- philosopher22
- philosophes22
- philosophic25
- phosphatase21
- phosphatide22
- phosphatize30
- phosphonium26
- phosphorite21
- phosphorous22
- phosphoryls24
- photomosaic22
- photosetter16
- photosphere21
- photostated17
- photostatic19
- photosystem21
- phytosterol19
- pianissimos18
- picoseconds22
- pinocytoses20
- pinocytosis20
- pittosporum21
- plesiosaurs16
- pomposities20
- portabellos19
- portamentos18
- portobellos19
- positioning18
- positivisms21
- positivists18
- positronium19
- possessedly18
- possessions15
- possessives18
- possibility20
- postclassic21
- postcollege21
- postconcert21
- postcranial19
- postdivorce22
- postediting18
- posteriorly17
- posterities14
- postforming23
- postglacial21
- postharvest20
- postholiday20
- postillions17
- postlanding20
- postmarital18
- postmarking24
- postmasters17
- postmortems20
- postnatally19
- postnuptial20
- postorbital18
- postponable22
- postprimary22
- postpuberty23
- postscripts20
- postseasons15
- postsyncing23
- posttension16
- postulating19
- postulation17
- postulators16
- postvocalic25
- postweaning21
- predisposed19
- predisposes18
- preposition18
- prepositive21
- presupposed22
- presupposes21
- proboscides21
- proboscises20
- prognostics20
- proposition18
- prosaically21
- prosauropod19
- prosceniums22
- prosciuttos18
- proscribers20
- proscribing23
- prosecuting21
- prosecution19
- prosecutors18
- proselyting20
- proselytise17
- proselytism20
- proselytize26
- proseminars18
- prosinesses15
- prosobranch23
- prospecting23
- prospective24
- prospectors20
- prostatisms17
- prostatitis14
- prosthetics19
- prosthetist16
- prostituted16
- prostitutes15
- prostitutor15
- prostrating17
- prostration15
- protosteles15
- protostelic18
- protostomes17
- psittacoses17
- psittacosis17
- purposeless19
- purposively25
- pyranosides18
- radiophotos17
- radiosondes14
- recitativos18
- recomposing23
- redeposited16
- redisposing18
- reexposures22
- religiosity16
- reposefully22
- repositions15
- repossessed15
- repossesses14
- repossessor14
- retinoscopy20
- retrospects17
- rhizosphere27
- ritardandos14
- ritornellos14
- rosemalings18
- rudderposts17
- saltarellos14
- sarcoidoses15
- sarcoidosis15
- scherzandos27
- schistosity18
- schistosome19
- semipostals18
- shigelloses17
- shigellosis17
- shovelnoses19
- signposting20
- sinuosities13
- sitosterols12
- sociosexual23
- sphingosine20
- spinosities15
- squooshiest23
- statoscopes17
- stegosaurus15
- stereoscope17
- stereoscopy19
- stethoscope19
- strenuosity15
- stroboscope20
- supercargos20
- superimpose21
- supermachos23
- supermicros21
- superposing21
- supposition19
- suppository20
- switcheroos19
- symposiarch24
- symposiasts19
- synaptosome20
- syndesmoses18
- syndesmosis18
- teliospores15
- testcrossed15
- testcrosses14
- theosophies18
- theosophist18
- thermoscope22
- thermostats16
- thimerosals17
- thiosulfate18
- transposing18