Yes, HARPY is a Scrabble word!

Letter values in Scrabble US: H 4, A 1, R 1, P 3, Y 4.

Is it a valid word?

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

a malicious woman with a fierce temper
(Greek mythology) vicious winged monster; often depicted as a bird with the head of a woman
any of various fruit bats of the genus Nyctimene distinguished by nostrils drawn out into diverging tubes
large black-and-white crested eagle of tropical America

Also: harpy bat, tube-nosed bat, tube-nosed fruit bat, harpy eagle, harpia harpyja.