/ Thesaurus / K Synonyms of kingdom of belgium Find synonyms for: Noun1. Belgium, Kingdom of Belgium, Belgiqueusage: a monarchy in northwestern Europe; headquarters for the European Union and for the North Atlantic Treaty OrganizationWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language