| Proktologe | proctologist |
| Proktologin | proctologist |
| Protologie | protology |
| Protolyse | protolysis |
| Oktologie | octology |
| Erotologie | erotology |
| Ontologe | ontologist |
| Kryptologe | cryptologist |
| Politologe | political scientist |
| Primatologe | primatologist |
| Phonologe | phonologist |
| Podologe | podiatrist |
| Pomologe | pomologist |
| Ökologe | ecologist |
| Kroprologie | scatology |
| Prostylos | prostyle |
| Protozoon | protozoan |
| Prolog | prologue prolog |
| Protokoll | minutes record report protocol |
| Oktole | octuplet |