- professional foul
- professional stage
- professional player
- piedmont glacier
- pied piper of hamelin
- postal rate commission
- phaseolus caracalla
- prednisolone
- polymox
- polynemidae
- penicillin F
- Pipracil
- penicillin binding protein
- phenoxymethyl penicillin
- penicillin O
- Polycillin
- penicillin V
- piperacillin
- penicillin G
- penicillin fast culture
- pilothouse
- phooey
- phoradendron flavescens
- pterosauria
- pristis pectinatus
- pyx chest
- passiflora edulis
- pseudobasement membrane
- pink of my John
- phyllocladus trichomanoides
- Parus bicolor
- Parus caeruleus
- papaver dubium
- plagal cadence
- platyspondyly
- Papaveraceae
- passionflower family
- papaya family
- Passifloraceae
- poppy family
- Portuguese heath
- Prince_of_Wales'_heath
- Prince of Wales heath
- phoxinus
- phragmacone
- pintado
- pinhole os
- pinicola enucleator
- perdix perdix
- pinguicula