| Hydrologin | hydrologist |
| Hydrologie | hydrology |
| Hydrologe | hydrologist |
| Andrologin | andrologist |
| Hydrogen | hydrogen |
| Andrologie | andrology |
| Horologie | horology |
| Urologin | urologist |
| Astrologin | astrologer astrologist |
| Neurologin | neurologist |
| Histologin | histologist |
| Ideologin | ideologue |
| Podologin | podiatrist |
| Hymnologie | hymnology |
| Mykologin | mycologist |
| Mythologin | mythologist mythologer |
| Physiologin | physiologist |
| Radiologin | radiologist |
| Hydroenergie | hydropower |
| Hydrochorie | hydrochory |