There are 20 8-letter words that start with 'hydr'.
| hydracid | hydragog | hydranth | hydrants |
| hydrases | hydrated | hydrates | hydrator |
| hydrides | hydrilla | hydrogel | hydrogen |
| hydroids | hydromel | hydronic | hydropic |
| hydropsy | hydroski | hydrosol | hydroxyl |
Note: These 20 8-letter words that start with 'hydr' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with hydro, hydra, hydri.
5-letter words start with 'hydr' (2)