Yes, CHAOSES is a Scrabble word!

Letter values in Scrabble US: C 3, H 4, A 1, O 1, S 1, E 1, S 1.

Is it a valid word?

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

a state of extreme confusion and disorder
the formless and disordered state of matter before the creation of the cosmos
(Greek mythology) the most ancient of gods; the personification of the infinity of space preceding creation of the universe
(physics) a dynamical system that is extremely sensitive to its initial conditions

Also: topsy-turvydom, topsy-turvyness.