| Hydrologie | hydrology |
| Hydrologin | hydrologist |
| Hydrologe | hydrologist |
| Andrologie | andrology |
| Horologie | horology |
| Hymnologie | hymnology |
| Hydroenergie | hydropower |
| Hydrochorie | hydrochory |
| Hydrolyse | hydrolysis |
| Hydronymie | hydronymy |
| Dendrologie | dendrology |
| Androloge | andrologist |
| Andrologin | andrologist |
| Aerologie | aerology |
| Antrologie | arthrology |
| Hemerologie | hemerology |
| Petrologie | petrology |
| Acarologie | acarology |
| Astrologie | astrology |
| Chorologie | chorology |