There are 252 9-letter words that start with 'fo'.
Note: These 252 9-letter words that start with 'fo' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with for, foo, fol, fou, fos, fox, fon, fog, foc, foa, foi, fov, foe, fom, fop, fow, fod, foz, fob, foy, foh.
3-letter words start with 'fo' (10)