/ Thesaurus / E Synonyms of eighteenth amendment Find synonyms for: Noun1. Eighteenth Amendmentusage: an amendment to the Constitution of the United States adopted in 1920; prohibited the manufacture and sale of alcoholic beverages; repealed in 1932WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language