Yes, ELBOWS is a Scrabble word!

Letter values in Scrabble US: E 1, L 1, B 3, O 1, W 4, S 1.

Is it a valid word?

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

hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped
a sharp bend in a road or river
a length of pipe with a sharp bend in it
the part of a sleeve that covers the elbow joint
the joint of a mammal or bird that corresponds to the human elbow

Also: elbow joint, human elbow, cubital joint, articulatio cubiti.