Fireman
Part of speech: noun
Definition: A person who is skilled in the work of fighting fire. A fireman that is of the male sex (see usage note). A man who keeps the fire going underneath a steam boiler (originally, shoveling coal by hand), particularly on a railroad locomotive. By extension of the above, an assistant on any locomotive, whether steam-powered or not. A relief pitcher.
Stoker
Part of speech: noun
Definition: A person who stokes, especially one on a steamship who stokes coal in the boilersA device for stoking a fire; a pokerA device that feeds coal into a furnace etc automaticallyA person who pedals on the back of a tandem bicycle