Yes, EQUIVOCAL is a Scrabble word!

Letter values in Scrabble US: E 1, Q 10, U 1, I 1, V 4, O 1, C 3, A 1, L 1.

Is it a valid word?

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

open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead
open to question
uncertain as a sign or indication