fire-eater vs guardian

fire-eater and guardian both are nouns.

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

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

Other hypernyms of fire-eater include defender, protector, shielder.

fire-eater (noun)	guardian (noun)
a performer who pretends to swallow fire	a person who cares for persons or property
a belligerent grouch
a member of a fire department who tries to extinguish fires