Yes, RATAFIAS is a Scrabble word!

Letter values in Scrabble US: R 1, A 1, T 1, A 1, F 4, I 1, A 1, S 1.

Is it a valid word?

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

sweet liqueur made from wine and brandy flavored with plum or peach or apricot kernels and bitter almonds
macaroon flavored with ratafia liqueur

Also: ratafia biscuit.