| Ideologin | ideologue |
| Ideologie | ideology |
| Ideologe | ideologist |
| Ideologem | idea |
| Geologin | geologist |
| Theologin | theologian |
| ideologisch | ideological ideologic |
| Areologie | areology |
| Osteologin | osteologist |
| Geologie | geology |
| Rheologie | rheology |
| Theologie | theology |
| Bryologin | bryologist |
| Histologin | histologist |
| Hydrologin | hydrologist |
| Indologie | Indology |
| Limnologin | limnologist |
| Onkologin | oncologist |
| Ontologin | ontologist |
| Podologin | podiatrist |