Breadcrumb Home > Thesaurus > N Synonyms of niagara Find synonyms for: Noun 1. Niagara, Niagara Falls usage: waterfall in Canada is the Horseshoe Falls; in the United States it is the American Falls 2. Niagara, Niagara River usage: a river flowing from Lake Erie into Lake Ontario; forms boundary between Ontario and New York WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of niagara (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: panache Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language