| Osteologin | osteologist |
| Osteologie | osteology |
| Osteologe | osteologist |
| Ontologin | ontologist |
| Astrologin | astrologer astrologist |
| Ideologin | ideologue |
| Geologin | geologist |
| Theologin | theologian |
| Histologin | histologist |
| Kosmetologin | cosmetologist |
| Kosmologin | cosmologist |
| Onkologin | oncologist |
| Sexologin | sexologist |
| Sinologin | sinologist |
| Ökologin | ecologist |
| Önologin | oenologist |
| Astrologie | astrology |
| Mythologin | mythologist mythologer |
| Oktologie | octology |
| Ontologie | ontology |