According to etymologist Barry Popik the word 'gunslinger' didn't come into use until the 1920 movie 'Drag Harlan' and then in the novels of famed Western author Zane Grey who first used it in his 1928 novel 'Nevada'. The word 'gunfighter' first appeared in the 1870s.

What is the meaning of the word gunslinger?

: a person noted for speed and skill in handling and shooting a gun especially in the American West.

What makes a gunslinger?

Today, the term "gunslinger" is more or less used to denote someone who is quick on the draw with a pistol, but can also refer to riflemen and shotgun messengers. The gunfighter is also one of the most popular characters in the Western genre and has appeared in associated films, video games, and literature.