Yes, QUICHES is a Scrabble word!

Letter values in Scrabble US: Q 10, U 1, I 1, C 3, H 4, E 1, S 1.

Is it a valid word?

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

a member of the Mayan people of south central Guatemala
a tart filled with rich unsweetened custard; often contains other ingredients (as cheese or ham or seafood or vegetables)
the Mayan language spoken by the Quiche