| Hydroxidion | hydroxide |
| Hydroxid | hydroxide |
| Hydrochinon | hydroquinone |
| Hydrologin | hydrologist |
| Pyramidion | pyramidion |
| Hydrocortison | hydrocortisone |
| Hydrogen | hydrogen |
| Hydroxyl | hydroxyl |
| hydrieren | hydrogenate |
| Hydrid | hydride |
| Hydrogenium | hydrogen |
| Hydrokortison | hydrocortisone |
| Hydrologie | hydrology |
| Hydronymie | hydronymy |
| hydrophil | hydrophilic |
| hydrophob | hydrophobic |
| Erdrotation | earth's rotation |
| Druidin | druidess |
| Eurovision | Eurovision |
| Adposition | adposition |