| Hydronym | hydronym |
| Hydronymie | hydronymy |
| Hydroxyl | hydroxyl |
| Hyperonym | hypernym hyperonym |
| Hyponym | hyponym |
| Hydrogen | hydrogen |
| hydro- | hydro- |
| Hydrant | hydrant fire hydrant fireplug |
| Hydrolyse | hydrolysis |
| Hydroxid | hydroxide |
| Hadron | hadron |
| Matronym | matronymic |
| Metronym | matronymic |
| Retronym | retronym |
| Akronym | acronym |
| Astronym | astronym |
| Choronym | choronym |
| Heteronym | heteronym |
| Meronym | meronym |
| Paronym | near-homophone |