There are 28 7-letter words that start with 'gru'.
Note: These 28 7-letter words that start with 'gru' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with grum, grue, grub, grun, gruf, grud, grut, grug, gruy, grui, grus.
4-letter words start with 'gru' (3)