There are 17 words that start with 'foam'.
| foam | foams | foamy | 
| foamed | foamer | foamers | 
| foamier | foamily | foaming | 
| foamable | foamiest | foamless | 
| foamlike | foaminess | foamflower | 
| foamflowers | foaminesses | |
Note: These 17 words that start with 'foam' are found from the USA & Canada version of the tournament Scrabble word list.