| Teleologie | teleology |
| Selenologie | selenology |
| Speleologie | speleology |
| Theologie | theology |
| Keltologie | Celtic studies |
| Telescopie | telescopy |
| Telefonie | telephony |
| teleologisch | teleological |
| Selenologe | selenologist |
| Selenologin | selenologist |
| Areologie | areology |
| Balneologie | balneology |
| Geologie | geology |
| Ideologie | ideology |
| Osteologie | osteology |
| Rheologie | rheology |
| Theologe | theologian |
| Theologin | theologian |
| Hemerologie | hemerology |
| Nephologie | nephology |