churl vs fire-eater

churl and fire-eater both are nouns.

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

As nouns, fire-eater is a hyponym of churl; that is, fire-eater is a word with a more specific, narrower meaning than churl:

Other hyponyms of churl include crab, crabby person, hothead, misanthrope, misanthropist.

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