11 letters
- penetration16
- percolation19
- perforation18
- peridotitic18
- periodontal17
- perorations15
- personation16
- pertinacity20
- petitionary17
- phonetician21
- phonotactic23
- picarooning21
- pinocytotic23
- pococurante22
- pontificate21
- portraiture15
- postconcert21
- potentiator15
- precipitant21
- precritical21
- predicating21
- predication19
- predicatory20
- predictions19
- predoctoral19
- predominant20
- premonition19
- preromantic21
- pretraining18
- proabortion18
- probationer18
- procercoids21
- procreating20
- procreation18
- procreators17
- procuration19
- propitiated18
- propitiator17
- prorogation17
- prostration15
- protections18
- protectoral18
- proteinuria16
- prothoracic22
- protonating18
- protonation16
- protonotary17
- protractile18
- protracting20
- protraction18
- protractive21
- protractors17
- provocation22
- pteranodons17
- radiometric18
- radiotracer15
- ratiocinate15
- reapportion18
- recantation16
- reciprocate20
- reciprocity22
- recitations15
- recognition18
- recondition17
- reconnoiter16
- reconnoitre16
- recontacted19
- recordation16
- redecorator15
- redirection16
- reiteration12
- reoperation15
- reordaining16
- reoxidation20
- repartition15
- replication19
- reportorial15
- reprobation18
- repudiation17
- reradiation13
- respiration15
- restoration12
- restriction15
- retardation13
- retractions15
- retroacting17
- retroaction15
- rhetorician17
- ropedancing22
- termination16
- territorial12
- terroristic14
- tetrasporic17
- topocentric21
- transection16
- transponder17
- transported16
- transporter15
- trepanation16
- trepidation16
- triceratops17
- tricornered16
- triplicated19
- tyrannicide19
- uncaptioned21
- unpatriotic19