fire-eater vs performer

fire-eater and performer both are nouns.

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

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

fire-eater: a performer who pretends to swallow fire
performer: an entertainer who performs a dramatic or musical work for an audience

Other hypernyms of fire-eater include performing artist.

fire-eater (noun)	performer (noun)
a performer who pretends to swallow fire	an entertainer who performs a dramatic or musical work for an audience
a belligerent grouch
a member of a fire department who tries to extinguish fires