| Tokologie | tocology |
| Ökologie | ecology |
| Topologie | topology |
| Autökologie | autecology physiological ecology |
| Ökologin | ecologist |
| Ökologe | ecologist |
| Arkologie | arcology |
| Mykologie | mycology |
| Onkologie | oncology |
| Toxikologie | toxicology |
| Turkologie | Turcology |
| Horologie | horology |
| Oologie | oology |
| Pönologie | penology |
| Doxologie | doxology |
| Homologie | homology |
| Morologie | morology |
| Motologie | motology |
| Noologie | noology |
| Nosologie | nosology |