/ Thesaurus / N Synonyms of nac Find synonyms for: Noun1. North Atlantic Council, NAC, councilusage: a council consisting of permanent representatives of all the member countries of NATO; has political authority and powers of decisionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language