There are 9 words that start with 'hypom'.
| hypomania | hypomanic | 
| hypomorph | hypomanias | 
| hypomanics | hypomorphs | 
| hypomorphic | hypomagnesemia | 
| hypomagnesemias | |
Note: These 9 words that start with 'hypom' are found from the USA & Canada version of the tournament Scrabble word list.