There are 15 words that start with 'foul'.
| foul | fouls | fouled |
| fouler | foully | foulard |
| foulest | fouling | foulards |
| foulings | foulness | foulbrood |
| foulbroods | foulnesses | foulmouthed |
Note: These 15 words that start with 'foul' are found from the USA & Canada version of the tournament Scrabble word list.