Yes, SUNRAYS is a Scrabble word!

Letter values in Scrabble US: S 1, U 1, N 1, R 1, A 1, Y 4, S 1.

Is it a valid word?

SUNRAYS is a valid word in the official Scrabble dictionary (US) and the UK Scrabble Dictionary, but not in Words with Friends (ENABLE).

a ray of sunlight
herb having a basal cluster of grey-green leaves and leafless stalks each with a solitary broad yellow flower head; desert areas Idaho to Arizona
a ray of artificial ultraviolet light from a sunray lamp

Also: enceliopsis nudicaulis, sun-ray.