12 letters
- pocketknives31
- polariscopes22
- polioviruses21
- politenesses17
- polyanthuses22
- polychromies26
- polyhedroses21
- polypeptides25
- polyploidies23
- polysorbates21
- polystyrenes21
- polysulfides24
- polyvalences27
- pomegranates21
- pontificates22
- popularities20
- porousnesses17
- portcullises21
- porterhouses18
- portlinesses17
- portraitures16
- positivities19
- postcolleges22
- postulancies21
- potabilities19
- praxeologies25
- preannounces22
- prebendaries20
- precedencies23
- preceptories21
- precertifies21
- preciosities18
- precipitates21
- preconceives26
- predominates20
- preeminences23
- prehistories17
- preliterates16
- premarriages20
- premeditates19
- prenominates20
- preparatives22
- prepossesses18
- prepotencies22
- preppinesses22
- preprocesses21
- prepuberties22
- prepurchases24
- prequalifies29
- prerogatives21
- presbyteries20
- preschedules23
- presentences20
- presidencies20
- presignifies21
- prespecifies24
- prettinesses16
- prevaricates22
- prissinesses16
- proclivities23
- proctologies21
- profiteroles19
- profligacies24
- profundities21
- proglottides19
- progressives21
- proliferates19
- promontories19
- promptitudes23
- promptnesses22
- pronucleuses22
- propensities19
- propernesses19
- prophetesses20
- proselytises18
- proselytizes27
- prospectuses22
- prosperities18
- protectories18
- prothalluses20
- proveniences24
- provocatives26
- prussianises17
- prussianizes26
- psephologies23
- pseudocyeses22
- psychiatries22
- psychologies25
- publicnesses24
- pulchritudes24
- putrescences23
- pyrargyrites21
- quadricepses29
- quaintnesses24
- quaternaries23
- quaternities23
- queasinesses23
- quirkinesses27
- radiometries16
- raggednesses18
- rakishnesses19
- rancidnesses18
- randomnesses18
- ranunculuses21
- ratatouilles15
- ratiocinates16
- rationalises14
- rationalizes23
- rattlesnakes18
- razzmatazzes51
- reactivities19
- reaggregates18
- reassemblies19
- reassurances17
- reattributes16
- reauthorizes24
- recalculates21
- recalibrates19
- recentnesses17
- rechallenges22
- reciprocates21
- recirculates20
- reclassifies19
- reconfigures22
- reconnoitres17
- recriminates19
- recultivates21
- recumbencies26
- redeliveries18
- redetermines17
- redundancies20
- reduplicates21
- reemergences21
- reemphasizes29
- reflectances23
- reformulates20
- refractories18
- refrigerates17
- regeneracies18
- regionalizes25
- regularities16
- regurgitates17
- rehypnotizes29
- reidentifies17
- reincarnates17
- reinnervates18
- reinoculates18
- reinstitutes14
- reinsurances18
- reintegrates15
- reintroduces18
- relandscapes21
- relativities17
- relicensures18
- relinquishes26
- relubricates20
- reluctancies21
- remembrances25
- remissnesses16
- remonstrates16
- remotenesses16
- renaissances17
- rendezvouses28
- renegotiates15
- renographies20
- renormalizes26
- reorientates13
- repellencies21
- repositories15
- reprivatizes28
- repugnancies23
- resegregates16
- resemblances23
- resensitizes22
- resiliencies17
- resocializes25
- resolidifies17
- respectables22
- responsories16
- restabilizes25
- restimulates17
- restoratives16
- restrictives19
- restructures17
- resuscitates16
- retranslates14
- retrogresses14
- retroviruses17
- revaccinates23
- reverberates19
- rhabdocoeles22
- rhinoceroses18
- rhinoscopies21
- rhinoviruses20
- rhizospheres28
- ribbonfishes24
- risibilities16
- robustnesses17
- rockabillies24
- rodenticides18