There are 28 7-letter words that start with 'gre'.
Note: These 28 7-letter words that start with 'gre' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with gree, grea, grey, grec, greg, grem, gren, grei, grew, greb.
4-letter words start with 'gre' (3)