madcap vs tearaway

madcap and tearaway both are nouns.

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

As adjectives, madcap and tearaway are synonyms defined as:

madcap and tearaway: characterized by undue haste and lack of thought or deliberation

Other synonyms of madcap include brainish, hotheaded, impetuous, impulsive.

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

madcap (noun)	tearaway (noun)
a reckless impetuous irresponsible person	a reckless and impetuous person

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