There are 17 words that start with 'gamm'.
| gamma | gammy | gammas |
| gammed | gammer | gammon |
| gammers | gammier | gamming |
| gammons | gammadia | gammiest |
| gammoned | gammoner | gammadion |
| gammoners | gammoning | |
Note: These 17 words that start with 'gamm' are found from the USA & Canada version of the tournament Scrabble word list.