| Speleologie | speleology |
| Speläologie | speleology |
| Speläologe | speleologist |
| Speläologin | speleologist |
| Selenologie | selenology |
| Teleologie | teleology |
| Selenologe | selenologist |
| Selenologin | selenologist |
| Petrologie | petrology |
| Sexologie | sexology |
| Sexuologie | sexology |
| Keltologie | Celtic studies |
| Pedologie | pedology |
| Pulmologie | pneumology pulmonology |
| Senologie | senology |
| Areologie | areology |
| Balneologie | balneology |
| Geologie | geology |
| Ideologie | ideology |
| Osteologie | osteology |