fireman vs fire-eater

fireman and fire-eater both are nouns.

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

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

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

Other synonyms of fireman include fire fighter, firefighter.

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