There are 11 words that start with 'biof'.
| biofilm | biofuel | biofilms |
| biofuels | biofouler | biofueled |
| biofoulers | biofouling | biofeedback |
| biofoulings | biofeedbacks | |
Note: These 11 words that start with 'biof' are found from the USA & Canada version of the tournament Scrabble word list.