Yes, HAWKMOTH is a Scrabble word!

Letter values in Scrabble US: H 4, A 1, W 4, K 5, M 3, O 1, T 1, H 4.

Is it a valid word?

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

any of various moths with long narrow forewings capable of powerful flight and hovering over flowers to feed

Also: hawk moth, sphinx moth, hummingbird moth.