Yes, INVOLUTIONS is a Scrabble word!

Letter values in Scrabble US: I 1, N 1, V 4, O 1, L 1, U 1, T 1, I 1, O 1, N 1, S 1.

Is it a valid word?

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

reduction in size of an organ or part (as in the return of the uterus to normal size after childbirth)
a long and intricate and complicated grammatical construction
marked by elaborately complex detail
the act of sharing in the activities of a group
the process of raising a quantity to some assigned power
the action of enfolding something