Breadcrumb Home > Thesaurus > C Synonyms of capitol building Find synonyms for: Noun1. Capitol, Capitol Buildingusage: the government building in Washington where the United States Senate and the House of Representatives meetWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. ✖ Related Content Daily Word Quiz: deracinate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language