Yes, CORSES is a Scrabble word!

Letter values in Scrabble US: C 3, O 1, R 1, S 1, E 1, S 1.

Is it a valid word?

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

an island in the Mediterranean; with adjacent islets it constitutes a region of France
a region of France on the island of Corsica; birthplace of Napoleon Bonaparte

Not playable in Scrabble US: CORSICA.