lunatic vs tearaway

lunatic and tearaway both are nouns.

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

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

lunatic (noun)	tearaway (noun)
an insane person	a reckless and impetuous person
a reckless impetuous irresponsible person

lunatic (adjective)	tearaway (adjective)
insane and believed to be affected by the phases of the moon	characterized by undue haste and lack of thought or deliberation