hothead vs tearaway

hothead and tearaway both are nouns.

Word	Noun	Adjective	Verb	Adverb
hothead	Yes	No	No	No
tearaway	Yes	Yes	No	No

As nouns, tearaway is a hyponym of hothead; that is, tearaway is a word with a more specific, narrower meaning than hothead:

hothead (noun)	tearaway (noun)
a reckless impetuous irresponsible person	a reckless and impetuous person
a belligerent grouch

hothead (adjective)	tearaway (adjective)
	characterized by undue haste and lack of thought or deliberation