There are 13 words that start with 'gruel'.
| gruel | gruels | grueled |
| grueler | gruelers | grueling |
| gruelled | grueller | gruelings |
| gruellers | gruelling | gruelingly |
| gruellings | ||
Note: These 13 words that start with 'gruel' are found from the USA & Canada version of the tournament Scrabble word list.