There are 18 words that start with 'stew'.
| stew | stews | stewy | 
| stewed | steward | stewbum | 
| stewing | stewpan | stewable | 
| stewards | stewbums | stewpans | 
| stewarded | stewardess | stewarding | 
| stewardship | stewardesses | stewardships | 
Note: These 18 words that start with 'stew' are found from the USA & Canada version of the tournament Scrabble word list.