14 letters
- perniciousness23
- perpendiculars27
- perspicacities26
- petrifications24
- petrochemicals29
- petrographical28
- petrologically27
- phantasmagoric28
- pharmaceutical30
- phenologically30
- phenotypically32
- philatelically28
- philologically30
- phlegmatically32
- phonologically30
- phosphorolytic30
- photoduplicate28
- photogenically29
- photolytically29
- photosynthetic27
- phraseological26
- physicalnesses26
- physiognomical31
- picornaviruses26
- pictorializing33
- picturizations31
- planetological26
- plasticization31
- pleonastically26
- pneumaticities25
- poeticalnesses22
- poikilothermic30
- politicalizing34
- politicization31
- polyphonically33
- polytheistical26
- pontifications25
- postganglionic27
- potentiometric24
- practicability29
- practicalities24
- preanesthetics23
- preconvictions29
- predictability27
- prefabricating29
- prefabrication27
- prepsychedelic32
- prepublication29
- presymptomatic31
- prettification24
- preunification26
- prevarications25
- primatological27
- prognosticated24
- prognosticates23
- prognosticator23
- prolificnesses25
- propagandistic27
- prosencephalic30
- prosthetically26
- prosthodontics24
- prototypically29
- proventriculus28
- pseudoclassics26
- psychasthenics30
- psychoacoustic31
- psychoanalytic31
- psychobiologic33
- psychochemical36
- psychodramatic31
- psychodynamics34
- psychoneurotic29
- psychophysical35
- psychosomatics30
- psychosurgical31
- pteridological25
- pyelonephritic29
- pyrheliometric28
- pyrogenicities25
- pyrometrically29
- pyroninophilic30
- quadruplicated34
- quadruplicates33
- qualifications32
- quantification32
- quasiparticles31
- quintuplicated34
- quintuplicates33
- quizzicalities46
- radicalization29
- radiologically25
- reapplications25
- rearticulating22
- recodification25
- rectifications24
- reductionistic23
- reduplications24
- refractometric26
- relubrications23
- republicanisms29
- republicanized36
- republicanizes35
- republications26
- restrictionism21
- restrictionist18
- reunifications23
- revivification29
- rhinencephalic30
- ridiculousness22
- rigidification24
- roentgenologic24
- sabermetrician24
- sanctification25
- saponification25
- scarifications24
- schismatically29
- schizophrenics37
- scholastically27
- scholasticates23
- scholasticisms26
- scientifically28
- sedimentologic25
- semasiological24
- semiautomatics24
- semicentennial24
- semicommercial30
- semiconducting29
- semiconductors26
- semiofficially30
- semiologically27
- sericulturists20
- seriocomically27
- serodiagnostic21
- serotoninergic21
- serviceability27
- serviceberries24
- sextuplicating32
- significancies27
- significations24
- silicification25
- silviculturist25
- simplification28
- simplistically28
- sociologically27
- sociopolitical25
- solicitorships23
- solicitousness20
- solidification23
- somnambulistic29
- sophisticating25
- sophistication23
- soteriological21
- specifications27
- spectrographic30
- spermatophytic30
- spiritualistic22
- sporotrichoses22
- sporotrichosis22
- staphylococcic34
- stereochemical26
- stereoisomeric20
- stereospecific26
- stochastically26
- stoichiometric25
- stratification21
- streptothricin23
- stultification23
- subatmospheric29
- subdistricting25
- subjectivistic37
- submetacentric28
- submicroscopic33
- subtherapeutic27
- superefficient28
- superficiality27
- superpatriotic24
- supersonically26
- supersymmetric29
- suspiciousness23
- syllabications25
- sympatholytics30
- synchronically30
- systematically26
- systematicness23
- tachistoscopic28
- talismanically26
- tautologically25
- technicalities24
- technicalizing36
- telangiectatic24
- telemetrically25
- teleologically25
- telepathically27
- telephonically28
- telescopically28
- teratogenicity22
- terminological25
- thanatological24
- theatricalisms23
- theatricalized30