fire fighter vs fireman

fire fighter and fireman both are nouns.

Word	Noun	Adjective	Verb	Adverb
fire fighter	Yes	No	No	No
fireman	Yes	No	No	No

As nouns, fire fighter and fireman are synonyms defined as:

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

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

fire fighter (noun)	fireman (noun)
a member of a fire department who tries to extinguish fires	play in which children pretend to put out a fire
	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