11 letters
- participant21
- participate20
- portmanteau19
- protonemata18
- ratiocinate15
- reanimation16
- recantation16
- trepanation16
- recombinant22
- pandemonium24
- partitioned16
- peridotitic18
- predication19
- predominant20
- proctodaeum22
- promptitude22
- propitiated18
- recondition17
- repudiation17
- trepidation16
- uncaptioned21
- uncommitted23
- unidiomatic20
- uninitiated15
- unmonitored18
- orientating15
- origination15
- outcapering21
- outcropping24
- outpainting19
- outpointing19
- pantomiming24
- petitioning18
- picarooning21
- pirouetting18
- preignition18
- protonating18
- recognition18
- recomputing24
- terminating18
- tumorigenic21
- unremitting19
- optokinetic22
- percolation19
- pilocarpine22
- planimetric22
- pleiotropic21
- pluripotent20
- protoplanet19
- recommittal21
- reluctation17
- replication19
- unemotional18
- unempirical23
- protonation16
- partitioner15
- parturition16
- pericranium22
- preromantic21
- procreation18
- procuration19
- propitiator17
- proteinuria16
- protraction18
- reapportion18
- repartition15
- retroaction15
- termitarium18
- opportunist19
- pantomimist21
- patrimonies18
- peritonitis15
- personation16
- pittosporum21
- pituitaries15
- pneumonitis20
- portamentos18
- positronium19
- precautions19
- precipitins21
- precipitous21
- preposition18
- presumption22
- propionates18
- propitiates17
- prosecution19
- protections18
- punctations20
- recitations15
- reputations16
- romanticise18
- romanticism21
- romanticist18
- ruminations17
- rustication16
- semiotician18
- supernation17
- tautomerism18
- tournaments17
- transection16
- truncations17
- unanimities17
- uncommonest23
- uninitiates14
- urtications16
- potentiator15
- punctuation21
- overcaution20
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