fire-eater vs churl

fire-eater and churl both are nouns.

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

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

Other hypernyms of fire-eater include crank, crosspatch, grouch, grump.

fire-eater (noun)	churl (noun)
a performer who pretends to swallow fire	a crude uncouth ill-bred person lacking culture or refinement
a belligerent grouch	a bad-tempered person
a member of a fire department who tries to extinguish fires	a selfish person who is unwilling to give or spend