Yes, EBONIES is a Scrabble word!

Letter values in Scrabble US: E 1, B 3, O 1, N 1, I 1, E 1, S 1.

Is it a valid word?

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

a very dark black
hard dark-colored heartwood of the ebony tree; used in cabinetwork and for piano keys
tropical tree of southern Asia having hard dark-colored heartwood used in cabinetwork

Also: coal black, jet black, pitch black, soot black, ebony tree, diospyros ebenum.