Yes, CATWALKS is a Scrabble word!

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

Is it a valid word?

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

narrow platform extending out into an auditorium
narrow pathway high in the air (as above a stage or between parts of a building or along a bridge)