There are 10 words that start with 'clamm'.
| clammy | clammed | clammer | 
| clammers | clammier | clammily | 
| clamming | clammiest | clamminess | 
| clamminesses | ||
Note: These 10 words that start with 'clamm' are found from the USA & Canada version of the tournament Scrabble word list.