Yes, DEERBERRIES is a Scrabble word!

Letter values in Scrabble US: D 2, E 1, E 1, R 1, B 3, E 1, R 1, R 1, I 1, E 1, S 1.

Is it a valid word?

DEERBERRIES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

small branching blueberry common in marshy areas of the eastern United States having greenish or yellowish unpalatable berries reputedly eaten by deer

Also: squaw huckleberry, vaccinium stamineum.