| Otologie | otology |
| Motologie | motology |
| Oktologie | octology |
| Ontologie | ontology |
| Oologie | oology |
| Ökologie | ecology |
| Önologie | oenology enology |
| Erotologie | erotology |
| Protologie | protology |
| Ontologe | ontologist |
| Ontologin | ontologist |
| Zytologie | cytology |
| -ologie | -ology |
| Aerologie | aerology |
| Horologie | horology |
| Pönologie | penology |
| Ufologie | ufology |
| Ökologin | ecologist |
| Önologin | oenologist |
| Apologie | apology apologia |