| pyrogen | pyrogenic |
| Pyroxen | pyroxene |
| Hydrogen | hydrogen |
| Kerogen | kerogen |
| Rogen | roe |
| erogen | erogenous |
| myogen | myogenic |
| pogen | pogo |
| prägen | emboss goffer imprint mint stamp strike coin mark characterise characterize form mould shape engrave a coherent give |
| Pyrop | pyrope |
| Pyrotol | pyrotol |
| Pyrenäen | Pyrenees |
| Pyromane | pyromaniac |
| Pyroxenit | pyroxenite |
| Tyrosin | tyrosine |
| Drogen- | narco- |
| Pirogge | pelmeni pierogi |
| Aerogel | aerogel |
| Androgen | androgen |
| androgen | androgen |