Yes, WRATHS is a Scrabble word!

Letter values in Scrabble US: W 4, R 1, A 1, T 1, H 4, S 1.

Is it a valid word?

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

intense anger (usually on an epic scale)
belligerence aroused by a real or supposed wrong (personified as one of the deadly sins)

Not playable in Scrabble US: IRA.