Yes, CLEAVAGES is a Scrabble word!

Letter values in Scrabble US: C 3, L 1, E 1, A 1, V 4, A 1, G 2, E 1, S 1.

Is it a valid word?

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

the state of being split or cleft
the breaking of a chemical bond in a molecule resulting in smaller molecules
(embryology) the repeated division of a fertilised ovum
the line formed by a groove between two parts (especially the separation between a woman's breasts)
the act of cleaving or splitting