#waterfall__falls__fall__cascade__cataract  a steep descent of the water of a river
  supertype:  body_of_water__water  the part of the earth's surface covered with water (such as a river or lake or ocean); "they invaded our territorial waters"; "they were sitting by the water's edge"
  subtype:  Niagara  Takkakaw
  instance:  American_Falls  Angel_Falls  Canadian_Falls  Cuquenan_Falls  Iguazu_Falls  Paulo_Afonso_Falls  Sete_Quedas  Tugela_Falls  Twin_Falls.Snake_River  Urubupunga_Falls  Victoria_Falls  Yosemite_Falls
  part of:  river  a large natural stream of water (larger than a creek); "the river was navigable for 50 miles"
     part of:  water_system__watersystem  a river and all of its tributaries

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