Yes, ELDERBERRIES is a Scrabble word!

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

Is it a valid word?

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

a common shrub with black fruit or a small tree of Europe and Asia; fruit used for wines and jellies
berrylike fruit of an elder used for e.g. wines and jellies

Also: black elder, common elder, european elder, sambucus nigra.