There are 8 12-letter words that start with 'boo'.
| bookbindings | bookkeepings | booksellings |
| boomeranging | boondogglers | boondoggling |
| bootlessness | bootstrapped | |
Note: These 8 12-letter words that start with 'boo' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with book, boot, boom, boog, boob, boon, booz, boos, bood, boor, booh, booc, booj, booe, booi.
4-letter words start with 'boo' (7)