Noun
a professional killer who uses a gun
a person who shoots a gun (as regards their ability)
Source: WordNetThe figure of the gunman in the window was inextricable from the victim and his history. This sustained Oswald in his cell. It gave him what he needed to live. The more time he spent in a cell, the stronger he would get. Everybody knew who he was now. Don DeLillo
If those kids had been carrying guns they would have gunned down this one gunman... Don't pray. Learn to use guns. Ann Coulter
The Gunman is useless. I know it. He knows it. The whole bank knows it. Markus Zusak
The Doc Holliday of legend is a gambler and gunman who appears out of nowhere in 1881, arriving in Tombstone with a bad reputation and a hooker named Big Nose Kate. Mary Doria Russell
I intended all of that. And this is what I like about this, and drawings like draw, like the gunman. I call this the shoot out, the high noon draw. That was also my intent as well as drawings; draw a bucket back to the cables and the whole idea about drawings... Lorna Cervantes
A 7-year-old boy was shot in north Minneapolis’ Folwell neighborhood late Tuesday afternoon, apparently when a gunman opened fire from a car on a nearby convenience store, police and officials said. Source: Internet