Yes, RAPHIAS is a Scrabble word!

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

Is it a valid word?

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

leaf fibers of the raffia palm tree; used to make baskets and mats etc.
feather palm of tropical Africa and Madagascar and Central and South America widely grown for commercial purposes

Also: genus raffia, genus raphia.