buffalo vs water buffalo

buffalo

noun
  • Any of the Old World mammals of the family Bovidae, such as the Cape buffalo, Syncerus caffer, or the water buffalo Bubalus bubalis. 

  • A related North American animal, the American bison, Bison bison. 

  • The buffalo fish (Ictiobus spp.). 

  • A nickel. 

verb
  • To outwit, confuse, deceive, or intimidate. 

  • To hunt buffalo. 

water buffalo

noun
  • A large ungulate, widely used as a domestic animal in Asia, South America. North Africa and Europe: Bubalus bubalis. 

  • A water tank mounted on a trailer to be towed by a motor vehicle. 

How often have the words buffalo and water buffalo occurred in a corpus of books? (source: Google Ngram Viewer )