13 letters
- pictographies26
- pictorializes29
- picturephones26
- piggishnesses23
- pinkishnesses24
- piquantnesses28
- piscicultures25
- piteousnesses18
- pitifulnesses22
- placabilities24
- planetologies21
- planographies25
- plantocracies24
- playabilities23
- playfulnesses25
- pliablenesses22
- pneumonitides23
- pointednesses19
- polarimetries20
- politicalizes30
- poltrooneries18
- polychotomies27
- polydactylies26
- polyethylenes25
- polyribosomes25
- polysyllables27
- polyurethanes23
- pompousnesses24
- porcelainizes30
- pornographies24
- portabilities20
- possibilities20
- postfractures23
- postgraduates20
- potablenesses21
- preachinesses22
- precalculuses26
- precipitances26
- precisenesses20
- preclearances24
- predeliveries22
- predepartures21
- predesignates20
- predestinates18
- predetermines21
- predischarges24
- prednisolones20
- predominances25
- preexistences27
- prefabricates25
- preformulates24
- pregnenolones22
- preliminaries21
- prematurities20
- preponderates21
- prerequisites26
- presbyterates21
- presentnesses18
- preservatives24
- presterilizes26
- prestructures21
- preventatives25
- pricklinesses25
- primatologies22
- primitivities23
- privatenesses21
- probabilities23
- procarbazines32
- proconsulates22
- prodigalities20
- profanenesses21
- professorates19
- proficiencies26
- profusenesses21
- progesterones19
- programmables28
- prolificacies26
- prolificities23
- promiscuities23
- propagandizes32
- propinquities30
- propoxyphenes34
- proprietaries19
- prostatitises16
- protectorates19
- protectresses19
- protogalaxies26
- protonotaries17
- prototrophies21
- protuberances24
- prudishnesses21
- pseudoalleles21
- pseudomonades23
- psychobabbles33
- psychogeneses26
- psychokineses28
- psychologises26
- psychologizes35
- psychometries26
- psychopathies28
- pteridologies20
- pteridophytes24
- puckishnesses27
- punctualities23
- pushfulnesses25
- pyridoxamines30
- pyromorphites26
- pyrophyllites27
- quarterstaves27
- queenlinesses26
- questionaries24
- quintessences28
- quotabilities27
- rabbitbrushes25
- radicalnesses19
- radiographies21
- radioisotopes17
- radionuclides21
- raffishnesses22
- rationalities15
- raucousnesses19
- raunchinesses21
- raylessnesses17
- razzamatazzes52
- reaccelerates20
- reactionaries17
- readabilities18
- reappearances23
- rearticulates18
- reassemblages22
- recapitalizes29
- recapitulates21
- recentrifuges23
- receptivities23
- reciprocities22
- recognizances32
- reconsecrates20
- reconstitutes18
- reconveyances27
- reddishnesses18
- redintegrates17
- rediscoveries21
- redistributes18
- reestablishes19
- reexperiences27
- reflectorizes29
- reflexivities28
- reflexologies27
- reformatories19
- rehabilitates19
- reinvigorates20
- relatednesses16
- relaxednesses23
- reliabilities18
- religiosities16
- remilitarizes26
- reminiscences24
- remonstrances21
- rentabilities18
- reoccurrences24
- repletenesses18
- repopularizes30
- repressurizes26
- repristinates17
- reproducibles25
- reproductives25
- reprographies23
- resistivities17
- resplendences23
- restfulnesses19
- restivenesses18
- resynthesizes27
- retentivities18
- reticulocytes23
- retinopathies19
- retinoscopies20
- retirednesses15
- reusabilities18
- reviviscences28
- rhabdomancies26
- rhabdoviruses24
- rhinoplasties20
- rhodomontades21
- rhythmicities25
- ribonucleases22
- riotousnesses15
- roadabilities18
- roguishnesses19
- roundednesses18
- rubicundities23
- ruinousnesses17
- ruthfulnesses22
- ruttishnesses17
- saccharomyces29
- saintlinesses16
- salmonberries21
- salmonelloses20
- salpingitises20
- saplessnesses18
- sarcophaguses24