Yes, BUCKSAW is a Scrabble word!

Letter values in Scrabble US: B 3, U 1, C 3, K 5, S 1, A 1, W 4.

Is it a valid word?

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

a saw that is set in a frame in the shape of an H; used with both hands to cut wood that is held in a sawbuck