| Protoplanet | protoplanet |
| protoplanetar | protoplanetary |
| protoplanetarisch | protoplanetary |
| Protoplasma | protoplasm |
| Protestant | Protestant demonstrator protester |
| Protokollant | minute-taker |
| Protolyse | protolysis |
| provokant | provocative |
| Exoplanet | exoplanet extrasolar planet |
| Propanol | propanol |
| Propanon | acetone |
| Propfan | propfan |
| Protoboard | breadboard |
| Protozoon | protozoan |
| protuberant | protuberant |
| prötteln | fettle |
| Proktologe | proctologist |
| Prolet | pleb |
| Propan | propane |
| Prophase | prophase |