Yes, CLOACA is a Scrabble word!

Letter values in Scrabble US: C 3, L 1, O 1, A 1, C 3, A 1.

Is it a valid word?

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

(zoology) the cavity (in birds, reptiles, amphibians, most fish, and monotremes but not mammals) at the end of the digestive tract into which the intestinal, genital, and urinary tracts open
a waste pipe that carries away sewage or surface water