Yes, ENACTMENT is a Scrabble word!

Letter values in Scrabble US: E 1, N 1, A 1, C 3, T 1, M 3, E 1, N 1, T 1.

Is it a valid word?

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

the passing of a law by a legislative body
a legal document codifying the result of deliberations of a committee or society or legislative body
acting the part of a character on stage; dramatically representing the character by speech and action and gesture

Also: characterization.