/ Thesaurus / U Synonyms of union army Find synonyms for: Noun1. Union Army, army, regular army, ground forces, blueusage: the northern army during the American Civil WarWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language