gunfighter       
noun [ C ] uk/ˈɡʌn.faɪ.tər/ us/ˈɡʌn.faɪ.t̬ɚ/
 (尤指牛仔)枪手
someone, especially a cowboy, who fights using guns
  Six gunfighters were hired to defend a town against bandits. 雇佣了六名枪手来保卫一个城镇,抵御土匪的袭击。 
 He became one of the most notorious gunfighters in the country. 他成了这个国家最臭名昭著的枪手之一。 
 See: gunfight
 - More examples
 - Many gamblers, gunfighters, and outlaws came to the town.
 - Ricky Nelson played the part of a cocky gunfighter.
 - A gunfighter stance probably just comes naturally down on a Texas ranch.