hothead vs fire-eater

hothead and fire-eater both are nouns.

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

As nouns, hothead and fire-eater are synonyms defined as:

hothead (noun)	fire-eater (noun)
a reckless impetuous irresponsible person	a performer who pretends to swallow fire
a belligerent grouch	a belligerent grouch
	a member of a fire department who tries to extinguish fires