11 letters
- novelettish19
- obligations18
- obliterates15
- obliterator15
- obstetrical18
- octahedrons18
- oligarchies19
- oligochaete19
- ontogenetic18
- opalescence22
- openhearted18
- operagoings19
- operational16
- optionality18
- optokinetic22
- optometries17
- orchestrate16
- ordinariest13
- organicists17
- orientalism16
- orientalist13
- orientalize22
- orientating15
- orientation13
- originators14
- ornithopter17
- orographies18
- orthocenter17
- orthoclases17
- orthoepists16
- orthopaedic20
- orthopedics20
- orthopedist17
- orthopteran17
- orthostatic16
- oscillating19
- oscillation17
- osteopathic19
- ostracising17
- ostracizing26
- ostrichlike21
- outcapering21
- outcheating20
- outgenerals16
- outpitching23
- outpreaches20
- outreaching20
- outsleeping19
- outsteering15
- overactions19
- overarching23
- overcasting21
- overcharges22
- overearnest16
- overheaping23
- overhearing20
- overheating20
- overleaping22
- overletting19
- overnighter20
- overoperate18
- overprecise21
- overpricing24
- overprotect21
- overreacher20
- overreaches20
- overreports18
- oversalting19
- oversetting18
- overstating18
- overstretch20
- overtighten20
- overtoiling19
- pacesetters17
- pacesetting20
- pageantries17
- palletising19
- pantheistic20
- paragenetic20
- parcenaries18
- parentheses17
- parenthesis17
- parenthetic20
- parenthoods18
- paresthetic19
- parishioner17
- parotitises14
- participles21
- partitioned16
- partitioner15
- partnerless16
- partnership20
- parturients16
- parturition16
- patchoulies21
- paternalist16
- paternities15
- paternoster15
- pathologies19
- pathologist19
- patriciates17
- patrimonies18
- patristical18
- patronising18
- patternings18
- patternless16
- pearlescent19
- peashooters16
- pectination19
- peculations20
- pedestaling19
- pedogenetic21
- pelletising19
- pellitories16
- penetrances19
- penetrating18
- penetration16
- penetrative19
- penicillate20
- penitential17
- penological22
- penologists18
- pentameters18
- pentarchies20
- pentathlete18
- pentathlons19
- percentages20
- percentiles19
- perceptions21
- perchlorate20
- percipients21
- percolating21
- percolation19
- percolators18
- peregrinate17
- perestroika18
- perfections21
- perforating20
- perforation18
- perforators17
- pericranial19
- peridotites15
- periodicals19
- periodontal17
- perionychia22
- peripatetic20
- peripeteias17
- peripherals20
- peripheries19
- peristaltic18
- peristomial18
- perithecial20
- peritonitis15
- permeations18
- permethrins20
- perorations15
- perpetrates17
- perpetrator17
- persecuting21
- persecution19
- perseverate18
- persevering21
- persistence18
- personalise16
- personalist16
- personality18
- personalize25
- personating18
- personation16
- personative19
- personators15
- personifier18
- pertinacity20
- pertinences19
- pestilences19
- petitionary17
- petitioners15
- petrologies17
- petrologist17
- petulancies20
- phagocytose23
- pharyngitis21
- phenacetins21
- pheneticist20
- phenocopies23
- phenologies20
- philanderer19
- philatelies18
- philatelist18
- philologies20
- philologist20
- phlogistons20
- phlogopites22
- phonemicist23
- phonetician21
- phonogramic25
- phonologies20
- phonologist20
- phonotactic23
- photometers19