| Theologin | theologian |
| Theologie | theology |
| Theologe | theologian |
| Rheologie | rheology |
| Ideologin | ideologue |
| Geologin | geologist |
| Ethnologin | ethnologist |
| Theodosia | Feodosiya |
| Theogonie | theogony |
| Theodolit | theodolite |
| theologisch | theological theologic |
| Areologie | areology |
| Osteologin | osteologist |
| Geologie | geology |
| Ideologie | ideology |
| Teleologie | teleology |
| Bryologin | bryologist |
| Onkologin | oncologist |
| Ontologin | ontologist |
| Phonologin | phonologist |