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.