Yes, EPIPHYTES is a Scrabble word!

Letter values in Scrabble US: E 1, P 3, I 1, P 3, H 4, Y 4, T 1, E 1, S 1.

Is it a valid word?

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

plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it

Also: air plant, epiphytic plant.