Gunfighter and gunslinger /ˈɡʌnslɪŋər/, are 20th century words, used in cinema or literature, referring to men in the American Old West who had gained a reputation as being dangerous with a gun. Gunman was a common term used for these individuals in the 19th century.
Read more about Gunfighter: Origin of The Term, Depiction in Culture, Fact Vs. Fiction, Famous Gunfights and Showdowns, Living On Reputation, Outlaw or Lawman, Modern Gunslinger, In Popular Culture