Breadcrumb Home > Thesaurus > I Synonyms of irs Find synonyms for: Noun 1. Internal Revenue Service, IRS, agency, federal agency, government agency, bureau, office, authority usage: the bureau of the Treasury Department responsible for tax collections WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of irs (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: jactation Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language