Yes, SAPOTES is a Scrabble word!

Letter values in Scrabble US: S 1, A 1, P 3, O 1, T 1, E 1, S 1.

Is it a valid word?

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

tropical American tree having wood like mahogany and sweet edible egg-shaped fruit; in some classifications placed in the genus Calocarpum
brown oval fruit flesh makes excellent sherbet

Also: marmalade tree, pouteria zapota, calocarpum zapota, marmalade plum.