Yes, BILBERRIES is a Scrabble word!

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

Is it a valid word?

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

erect European blueberry having solitary flowers and blue-black berries
erect blueberry of western United States having solitary flowers and somewhat sour berries
blue-black berries similar to American blueberries

Also: viccinium myrtillus, thin-leaved bilberry, mountain blue berry, viccinium membranaceum, european blueberry.

Not playable in Scrabble US: WHINBERRY.