fire-eater vs fireman

fire-eater and fireman both are nouns.

Word	Noun	Adjective	Verb	Adverb
fire-eater	Yes	No	No	No
fireman	Yes	No	No	No

As nouns, fire-eater and fireman are synonyms defined as:

fire-eater and fireman: a member of a fire department who tries to extinguish fires

Other synonyms of fire-eater include fire fighter, firefighter.

fire-eater (noun)	fireman (noun)
a performer who pretends to swallow fire	play in which children pretend to put out a fire
a belligerent grouch	a member of a fire department who tries to extinguish fires
a member of a fire department who tries to extinguish fires	a laborer who tends fires (as on a coal-fired train or steamship)
	a pitcher who does not start the game