| Noun | 1. | Niagara Falls - waterfall in Canada is the Horseshoe Falls; in the United States it is the American FallsOntario - a prosperous and industrialized province in central Canada American Falls - a part of Niagara Falls in western New York (north of Buffalo) Canadian Falls, Horseshoe Falls - a part of Niagara Falls in Ontario Niagara River, Niagara - a river flowing from Lake Erie into Lake Ontario; forms boundary between Ontario and New York |
| 2. | Niagara Falls - a city in western New York State at the falls of the Niagara river; tourist attraction and honeymoon resort |