11 letters
- perversions19
- petitionary17
- petitioners15
- petitioning18
- photodiodes18
- photoionize26
- photoperiod20
- physiognomy26
- physiologic24
- pincushions22
- piousnesses16
- pixilations23
- plagioclase21
- plantations17
- pleiotropic21
- plesiosaurs16
- pollination18
- populations20
- portionless16
- positioning18
- possessions15
- posteriorly17
- postillions17
- posttension16
- postulation17
- prebiologic23
- precautions19
- precessions18
- preclusions20
- predication19
- predictions19
- preelection19
- preemptions21
- prehensions18
- preignition18
- preinvasion20
- prelections19
- prelibation19
- premonition19
- premunition20
- preparation18
- preportions18
- preposition18
- prestigious17
- presumption22
- pretensions16
- pretentious16
- preventions20
- previsional20
- previsioned20
- prioritized24
- prioritizes23
- proabortion18
- probational19
- probationer18
- processions18
- procreation18
- procuration19
- productions20
- profanation19
- professions18
- progression17
- prohibition20
- projections27
- promotional19
- propagation20
- propionates18
- proportions18
- proposition18
- propulsions20
- prorogation17
- prosecution19
- prostration15
- protections18
- protonation16
- protraction18
- protrusions16
- provisional20
- provisioned20
- provisioner19
- provocation22
- publication23
- pullulation20
- punctations20
- punctilious21
- punctuation21
- pustulation18
- quadrillion25
- quaternions23
- questionary24
- questioners22
- questioning25
- quintillion25
- radiational14
- radioactive19
- radiocarbon19
- radiographs19
- radiography21
- radiolabels17
- radiolarian14
- radiologies15
- radiologist15
- radiolucent18
- radiometers15
- radiometric18
- radiophones18
- radiophotos17
- radiosondes14
- radiotracer15
- rapaciously21
- rapscallion20
- rarefaction18
- ratiocinate15
- rationalise13
- rationalism16
- rationalist13
- rationality15
- rationalize22
- reaccession18
- reactionary17
- readmission16
- realization22
- reanimation16
- reapportion18
- reassertion12
- recantation16
- recessional16
- recitations15
- reclamation19
- recognition18
- recondition17
- recordation16
- recreations15
- redactional17
- redemptions19
- redigestion15
- redirection16
- redivisions17
- reductional18
- reeducation17
- reelections16
- reemissions15
- refashioned18
- reflections19
- reformation18
- refractions18
- refutations16
- regionalism18
- regionalist15
- regionalize24
- regressions14
- regulations16
- rehydration17
- reification18
- reignitions15
- reinfection19
- reinflation17
- reinjection25
- reinsertion13
- reinvasions17
- reinvention18
- reiteration12
- relaxations20
- relegations15
- religionist15
- religiosity16
- religiously18
- relocations16
- reluctation17
- remediation16
- remigration17
- renovations17
- reoperation15
- reoxidation20
- reparations15
- repartition15
- repetitions15
- repetitious15
- replication19
- repositions15
- repressions15
- reprobation18
- reprovision19
- repudiation17
- reputations16
- requisition22
- reradiation13
- rescissions15
- reservation16
- resignation15
- resolutions14
- resorptions15
- respiration15
- responsions16
- restitution13
- restoration12
- restriction15
- resumptions19
- retaliation13
- retardation13