- procathedral22
- procedural19
- processional20
- proctological26
- proctorial17
- procural16
- procuratorial21
- prodigal15
- prodromal17
- productional22
- proemial15
- professional20
- professorial19
- progestational21
- progressional20
- projectional29
- promotional19
- pronominal19
- pronunciational26
- prophetical23
- proportional20
- proposal15
- propositional21
- proprietorial20
- prosecutorial21
- prosodical18
- prosomal15
- prosopographical33
- prostomial17
- protectoral18
- prothonotarial21
- protonemal18
- protonematal20
- prototypal19
- prototypical24
- protozoal22
- proverbial21
- providential22
- provincial22
- proviral16
- provisional20
- proximal22
- prudential17
- psephological28
- pseudopodal21
- pseudopodial22
- psychical23
- psychoanalytical34
- psychobiographical42
- psychobiological36
- psychochemical36
- psychohistorical32
- psychological30
- psychopathological40
- psychopharmacological49
- psychophysical35
- psychophysiological43
- psychosexual31
- psychosocial26
- psychosurgical31
- pteridological25
- puberal15
- pubertal16
- pudendal16
- puerperal17
- pulpal15
- pulpital17
- punctual18
- pupal13
- puparial16
- purgatorial18
- puritanical20
- pycnidial20
- pygidial17
- pyramidal19
- pyramidical24
- pyrexial21
- pyridoxal23
- pyromaniacal25
- pyrometallurgical34
- pyrotechnical28
- quadrantal23
- quadrennial25
- quadricentennial34
- quadrilateral26
- quadrivial26
- quadrupedal28
- quantal19
- quantificational35
- quarterfinal27
- quasicrystal28
- quetzal27
- quezal26
- quincentennial32
- quincuncial31
- quincunxial35
- quinquennial36
- quintal19
- quintessential27
- quixotical31
- quizzical41
- rabbinical21
- rachial13
- racial10
- radial8
- radiational14
- radical12
- radiobiological26
- radiochemical26
- radiological20
- radiopharmaceutical36
- raptorial13
- rarefactional21
- rascal10
- rasorial9
- ratal6
- rational10
- real5
- reappraisal18
- rearousal11
- reburial13
- rebuttal13
- recessional16
- reciprocal20
- recital11
- recoal10
- recombinational27
- recommittal21
- recreational17
- rectal10
- rectorial13
- recusal12
- redactional17
- redial8
- redistributional23
- reductional18
- referential16
- referral12
- reflectional21
- reformational21
- refusal12
- refutal12
- regal8
- regental12
- regicidal16
- regimental17
- reginal11
- regional12
- regnal10
- rehearsal12
- relational13
- remedial13
- remigial14
- reminiscential23
- remittal12
- removal15
- renal7
- renewal12
- rental8
- reorganizational30
- repeal10
- repetitional17
- reportorial15
- reposal11
- representational22
- reprieval17
- reprisal12
- reproval16
- reputational18
- requital19
- reseal7
- residential14
- residual11
- restoral9
- resurrectional20
- retial7
- reticuloendothelial30
- retinal9
- retinotectal17
- retral7
- retrial8
- retrieval14
- retroperitoneal20
- retroviral15
- reveal11
- revenual15
- reverential17
- reversal13
- reversional17
- revictual18
- reviewal16
- revisal12
- revival16
- rhapsodical21
- rheological20
- rhetorical16
- rhinal10
- rhizobial24
- rhizoidal22
- rhombohedral24