| Hydrogeochemie | hydrogeochemistry |
| Hydrochemie | hydrochemistry |
| Biogeochemie | biogeochemistry |
| Hydrographie | hydrography |
| Hydrochorie | hydrochory |
| Geochemie | geochemistry |
| Oleochemie | oleochemistry |
| Stereochemie | stereochemistry |
| Hydroenergie | hydropower |
| Hydrogenase | hydrogenase |
| Hydrogenium | hydrogen |
| Hydrologie | hydrology |
| Hydronymie | hydronymy |
| Kosmochemie | cosmochemistry |
| Radiochemie | radiochemistry |
| Thermochemie | thermochemistry |
| Agrochemie | agrochemistry |
| Petrochemie | petrochemistry |
| Meereschemie | chemical oceanography |
| Hydrocephalus | hydrocephalus |