There are 17 words that start with 'moss'.
| moss | mosso | mossy | 
| mossed | mosser | mosses | 
| mossers | mossier | mossing | 
| mossback | mossiest | mosslike | 
| mossbacks | mossgrown | mossiness | 
| mossbacked | mossinesses | |
Note: These 17 words that start with 'moss' are found from the USA & Canada version of the tournament Scrabble word list.