Gunman (noun)

1. A man who is armed with a gun.
2. A man who uses a gun to commit a crime or violence.

Origin:

Gun + man.

Examples:

1. The police surrounded the building where the gunman was hiding.
2. The gunman opened fire on the crowd.
3. The hostages were taken by a group of heavily armed gunmen.
4. The gunman was finally apprehended by the police.
5. The gunman was shot and killed by the police.