There are 13 12-letter words that start with 'blac'.
| blackballing | blackberries | blackbirders |
| blackbirding | blackguarded | blackguardly |
| blackhanders | blackjacking | blacklisters |
| blacklisting | blackmailers | blackmailing |
| blacktopping | ||
Note: These 13 12-letter words that start with 'blac' are found from the USA & Canada version of the tournament Scrabble word list.