Yes, TENESMUSES is a Scrabble word!

Letter values in Scrabble US: T 1, E 1, N 1, E 1, S 1, M 3, U 1, S 1, E 1, S 1.

Is it a valid word?

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

painful spasm of the anal sphincter along with an urgent desire to defecate without the significant production of feces; associated with irritable bowel syndrome