There are 18 words that start with 'start'.
| start | starts | started | 
| starter | startle | startsy | 
| startup | starters | starting | 
| startled | startler | startles | 
| startups | startlers | startling | 
| startlement | startlingly | startlements | 
Note: These 18 words that start with 'start' are found from the USA & Canada version of the tournament Scrabble word list.