- padrone12
- palatine13
- pane8
- panettone14
- pangene14
- panne10
- pantalone15
- papaverine21
- papyrine17
- paradichlorobenzene43
- pararosaniline20
- parathormone21
- paravane16
- pardine12
- pargyline18
- passerine13
- patine10
- pavane14
- pavonine17
- pelerine13
- pemoline16
- peneplane18
- penicillamine26
- penne10
- pennine13
- pensione13
- pentamidine20
- pentane12
- pentazocine28
- pentene12
- pentobarbitone25
- pepsine14
- peptone14
- percaline17
- perchloroethylene32
- peregrine15
- perilune14
- perphenazine31
- petaline13
- phenacaine20
- phenanthrene22
- phenazine25
- phencyclidine30
- phenmetrazine32
- phenobarbitone27
- phenothiazine31
- phentolamine23
- phenylalanine25
- phenylbutazone37
- phenylephrine28
- phenylethylamine34
- phenylpropanolamine40
- pheromone18
- philhellene22
- philistine17
- phocine16
- phone11
- phosgene16
- phosphatidylcholine40
- phosphatidylethanolamine46
- phosphene20
- phosphine20
- phosphocreatine29
- phthalocyanine29
- physostigmine26
- phytane15
- phytohormone25
- picayune18
- picoline16
- picturephone25
- pilocarpine22
- pinbone15
- pine8
- pinecone16
- pinene11
- pipeline16
- piperazine26
- piperidine18
- piperine15
- pipestone16
- piscine14
- pithecanthropine31
- plane10
- plasmagene20
- plasticene18
- plasticine18
- plastoquinone29
- platane12
- platyrrhine20
- plotline14
- polyamine19
- polybutadiene25
- polycrystalline29
- polyene14
- polyethylene24
- polygene17
- polylysine20
- polyphone21
- polypropylene29
- polystyrene20
- polytene15
- polythene18
- polyurethane22
- pone8
- pontine12
- porcine14
- porcupine20
- postdeadline19
- postpone15
- potline12
- potstone12
- praline12
- predefine17
- predestine15
- predetermine20
- prednisolone19
- prednisone16
- pregnenolone21
- premune15
- primine14
- pristane12
- pristine12
- procaine15
- procarbazine31
- profane14
- progesterone18
- prolamine17
- proline12
- promine14
- prone9
- propane14
- propene14
- propine14
- propone14
- propoxyphene33
- propylene19
- protamine16
- provolone18
- prune10
- psittacine17
- pteridine14
- ptomaine15
- puisne11
- pulicene17
- purine11
- purline13
- purslane14
- putrescine18
- pyrene12
- pyridine15
- pyridoxamine29
- pyridoxine24
- pyrimethamine27
- pyrimidine20
- pyrone12
- pyronine15
- pyroxene21
- quarantine22
- quasicrystalline34
- quercine22
- quinacrine25
- quinidine22
- quinine19
- quinoline22
- quinone19
- radiophone17
- radiotelephone22
- raisonne10
- ralline10
- rapine10
- ratine7
- ratline9
- ratsbane12
- ravine11
- recane10
- recline12
- recombine19
- reconvene18
- redbone12
- redefine13
- redetermine16
- redline10
- redone8
- reenthrone14
- reexamine20
- refine10
- reguline13
- reimagine15
- reline8
- relumine14
- repine10
- reserpine13
- reshine10
- reshone10
- resupine13
- retene7
- retine7
- retinene10
- retune8
- rezone16