14 letters
- pericarditides22
- perilousnesses20
- periodizations28
- periodontology24
- perissodactyls24
- peritrichously26
- permeabilities24
- permissibility26
- permissiveness25
- permittivities24
- perniciousness23
- perpendiculars27
- perseverations22
- personableness23
- perspicacities26
- persuasiveness23
- pertinaciously25
- perturbational23
- perversenesses22
- perviousnesses23
- pestilentially23
- petrifications24
- petrochemicals29
- petrochemistry27
- petrographical28
- petrologically27
- pettifoggeries24
- photoperiodism26
- polydispersity26
- postexperience31
- preexperiments31
- preoperational22
- preoperatively27
- preperformance30
- prosperousness22
- reexperiencing31
- repetitiveness22
- respectability26
- respectfulness26
- respectiveness25
- retrospections21
- retrospectives24
- sesquipedalian30
- sesquiterpenes28
- slipperinesses22
- snippersnapper28
- specialisation22
- specialization31
- specifications27
- speciousnesses22
- spectatorships25
- spectinomycins30
- spectrographic30
- spectrometries23
- spectroscopies26
- spectroscopist26
- speechlessness24
- spellbindingly30
- spermatogonial24
- spermatogonium27
- spermatophores25
- spermatophytes27
- spermatophytic30
- spermiogeneses23
- spermiogenesis23
- spinthariscope26
- stapedectomies24
- stereospecific26
- stupendousness22
- subspecialists25
- subspecialized35
- subspecializes34
- subspecialties25
- subtherapeutic27
- superabounding27
- superabsorbent25
- superabundance28
- superachievers27
- superadditions21
- superambitious25
- superannuating24
- superannuation22
- supercalenders24
- superciliously26
- supercivilized36
- supercolliders24
- supercomputers28
- superconducted28
- superconductor27
- superconfident27
- supercontinent24
- supercriminals26
- superdiplomats26
- supereffective31
- superefficient28
- superelevating26
- superelevation24
- supereminences26
- supereminently26
- superenciphers27
- supererogation21
- supererogatory22
- superexpensive33
- superexpresses28
- superfetations22
- superficiality27
- supergravities24
- superhardening25
- superhumanness26
- superimposable28
- superincumbent30
- superinduction25
- superinfecting28
- superinfection26
- superinsulated22
- superintendent22
- superintending24
- superintensity22
- superlobbyists27
- superloyalists22
- superluxurious29
- supermasculine27
- superministers22
- supernaturally24
- supernormality25
- supernutrition21
- superorganisms24
- superovulating27
- superovulation25
- superpatriotic24
- superphenomena28
- superphosphate28
- superpositions22
- superqualities29
- supersaturated20
- supersaturates19
- superscription25
- supersecrecies24
- supersensitive23
- supersexuality29
- supersonically26
- superspectacle28
- superstimulate23
- superstrengths23
- superstructure23
- supersymmetric29
- superthrillers22
- supervirtuosos23
- tachistoscopes25
- teletypewriter23
- trapezohedrons30
- ultracompetent26
- unappetizingly37
- underdeveloped27
- understrappers23
- unexpectedness31
- unsuspectingly29
- vituperatively29
- wafflestompers30
- wappenschawing35
- weatherpersons23
- whippersnapper32