/ Thesaurus / D Synonyms of danube river Find synonyms for: Noun1. Danube, Danube River, Danauusage: the 2nd longest European river (after the Volga); flows from southwestern Germany to the Black Sea; "Vienna, Budapest, and Belgrade are on the banks of the Danube"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: heifer Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language