| Ornithologin | ornithologist |
| Ornithologie | ornithology |
| Ornithologe | ornithologist |
| ornithologisch | ornithological ornithologic |
| Ontologin | ontologist |
| Ornithin | ornithine |
| Paläornithologin | paleornithologist |
| Ornithochorie | ornithochory |
| Anthologie | anthology |
| Mythologin | mythologist mythologer |
| Graphologin | graphologist |
| Oneirologin | oneirologist |
| Onkologin | oncologist |
| Osteologin | osteologist |
| Politologin | political scientist |
| Proktologin | proctologist |
| Önologin | oenologist |
| Ontologie | ontology |
| Ornithopter | ornithopter |
| Ornithose | ornithosis |