Fireman

noun

1. Someone (especially one who is male) who is skilled in the work of fighting fire.
2. A person (originally a man) who keeps the fire going underneath a steam boiler (originally, shoveling coal by hand), particularly on a railroad locomotive or steamship.
3. By extension of the above, an assistant on any locomotive, whether steam-powered or not.
4. A relief pitcher.
5. A safety inspector in coal mines.