There are 12 words that start with 'firef'.
| firefly | firefang | firefangs | 
| firefight | fireflies | fireflood | 
| firefanged | firefights | firefloods | 
| firefanging | firefighter | firefighters | 
Note: These 12 words that start with 'firef' are found from the USA & Canada version of the tournament Scrabble word list.