There are 17 words that start with 'boul'.
| boule | boules | 
| boulle | boulder | 
| boulles | boulders | 
| bouldery | bouldered | 
| boulderer | boulevard | 
| boulderers | bouldering | 
| boulevards | boulevardier | 
| boulevardiers | bouleversement | 
| bouleversements | |
Note: These 17 words that start with 'boul' are found from the USA & Canada version of the tournament Scrabble word list.