12 letters
- physiognomic28
- physiography28
- physiologies22
- physiologist22
- pictographic28
- planographic27
- plasminogens23
- plasmogamies24
- pneumatology25
- pneumographs27
- pogonophoran24
- polarography25
- pornographer23
- pornographic26
- praxeologies25
- precognition22
- precognitive25
- preprogramed24
- prerogatived22
- prerogatives21
- primogenitor21
- proctologies21
- proctologist21
- progesterone18
- progestogens20
- proglottides19
- prognathisms23
- programmable27
- programmatic26
- programmings26
- progressions18
- progressives21
- prologuizing31
- prorogations18
- proteoglycan24
- protozoology29
- psephologies23
- psephologist23
- psychographs29
- psychologies25
- psychologise25
- psychologism28
- psychologist25
- psychologize34
- pyrogenicity25
- radiobiology21
- radioecology21
- radiographed21
- radiographic23
- radiological20
- radiologists16
- recognitions19
- recognizable31
- recognizably33
- recognizance31
- renographies20
- rephotograph24
- reprograming23
- reprogrammed24
- reprographer22
- reprographic25
- retrogradely18
- retrograding18
- retrogressed15
- retrogresses14
- rheumatology23
- rotogravures19
- scatological22
- scenographer23
- scenographic26
- schizogonies29
- schizogonous30
- secretagogue20
- seismographs22
- seismography24
- seismologies18
- seismologist18
- selenologies17
- selenologist17
- semeiologies18
- semiological22
- semiologists18
- sloganeering19
- sociobiology23
- sociologeses18
- sociological22
- sociologists18
- sockdologers23
- somatologies18
- sonographers20
- sonographies20
- spectrograms23
- spectrograph25
- speleologies19
- speleologist19
- sphygmograph31
- sporogeneses18
- sporogenesis18
- stenographer20
- stenographic23
- stereographs19
- stereography21
- stereologies15
- submicrogram27
- subrogations19
- synecologies21
- tautological20
- technologies21
- technologist21
- technologize30
- teleological20
- teleologists16
- teratologies15
- teratologist15
- theologising20
- theologizers26
- theologizing29
- thermographs24
- thermography26
- tobogganings23
- tobogganists20
- togetherness17
- tomographies22
- topographers22
- topographies22
- toxicologies25
- toxicologist25
- transmogrify23
- tribological22
- tribologists18
- trichologies20
- trichologist20
- trimetrogons18
- tropological22
- trypsinogens21
- typographers24
- typographies24
- typographing27
- unapologetic23
- unecological24
- unprogrammed26
- unrecognized30
- urbanologies20
- urbanologist20
- urinogenital18
- venographies24
- vexillologic31
- videographer24
- volcanologic27
- watchdogging28
- waterlogging23
- xerographies26
- xylographers29
- xylographies29
- zoogeography32
- zoologically31