Breadcrumb Home > Thesaurus > B Synonyms of benelux Find synonyms for: Noun1. Benelux, customs unionusage: a customs union comprising Belgium and Netherlands and LuxembourgWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of benelux (Dictionary) ✖ Related Content Daily Word Quiz: guilloche Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language