Yes, APOPHYSES is a Scrabble word!

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

Is it a valid word?

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

(botany) a natural swelling or enlargement: at the base of the stalk or seta in certain mosses or on the cone scale of certain conifers
(anatomy) a natural outgrowth or projection on an organ or body part such as the process of a vertebra