Yes, WAINSCOTS is a Scrabble word!

Letter values in Scrabble US: W 4, A 1, I 1, N 1, S 1, C 3, O 1, T 1, S 1.

Is it a valid word?

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

panel forming the lower part of an interior wall when it is finished differently from the rest of the wall
wooden panels that can be used to line the walls of a room