There are 17 words that start with 'boll'.
| boll | bolls | bolled | 
| bollix | bollox | bollard | 
| bolling | bollards | bollixed | 
| bollixes | bollocks | bolloxed | 
| bolloxes | bollworm | bollixing | 
| bolloxing | bollworms | |
Note: These 17 words that start with 'boll' are found from the USA & Canada version of the tournament Scrabble word list.