There are 16 words that start with 'spong'.
| sponge | spongy | sponged | 
| sponger | sponges | spongin | 
| spongers | spongier | spongily | 
| sponging | spongins | spongiest | 
| spongeware | sponginess | spongewares | 
| sponginesses | ||
Note: These 16 words that start with 'spong' are found from the USA & Canada version of the tournament Scrabble word list.