Yes, BLUEBERRIES is a Scrabble word!

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

Is it a valid word?

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

any of numerous shrubs of the genus Vaccinium bearing blueberries
sweet edible dark-blue berries of either low-growing or high-growing blueberry plants

Also: blueberry bush.