Breadcrumb Home > Thesaurus > O Synonyms of opium den Find synonyms for: Noun1. opium den, building, edificeusage: a building where opium is sold and usedWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. ✖ Related Content Daily Word Quiz: prandial Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language