Noun niagara has 2 senses
  1. Niagara, Niagara Falls - waterfall in Canada is the Horseshoe Falls; in the United States it is the American Falls
    --1 is a kind of waterfall, falls
    --1 is a part of
     Niagara, Niagara River; Ontario; New York, New York State, Empire State, NY
    --1 has parts: American Falls; Canadian Falls, Horseshoe Falls
  2. Niagara, Niagara River - a river flowing from Lake Erie into Lake Ontario; forms boundary between Ontario and New York
    --2 is a kind of river
    --2 is a part of
     United States, United States of America, America, US, U.S., USA, U.S.A.; Canada
    --2 has parts: Niagara, Niagara Falls
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