There are 17 words that start with 'groo'.
| groom | grooms | groove |
| groovy | groomed | groomer |
| grooved | groover | grooves |
| groomers | grooming | groovers |
| groovier | grooving | groomsman |
| groomsmen | grooviest | |
Note: These 17 words that start with 'groo' are found from the USA & Canada version of the tournament Scrabble word list.