#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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