ranger vs fire-eater

ranger and fire-eater both are nouns.

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

As nouns, fire-eater is a hypernym of ranger; that is, fire-eater is a word with a broader meaning than ranger:

ranger: an official who is responsible for managing and protecting an area of forest
fire-eater: a member of a fire department who tries to extinguish fires

Other hypernyms of ranger include fire fighter, firefighter, fireman, functionary, official.

ranger (noun)	fire-eater (noun)
an official who is responsible for managing and protecting an area of forest	a performer who pretends to swallow fire
a member of a military unit trained as shock troops for hit-and-run raids	a belligerent grouch
	a member of a fire department who tries to extinguish fires