There are 16 words that start with 'stir'.
| stir | stirk | stirp | 
| stirs | stirks | stirps | 
| stirpes | stirred | stirrer | 
| stirrup | stirrers | stirring | 
| stirrups | stirabout | stirrings | 
| stirabouts | ||
Note: These 16 words that start with 'stir' are found from the USA & Canada version of the tournament Scrabble word list.