U.K. vs tearaway

U.K. and tearaway both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.K.	Yes	No	No	No
tearaway	Yes	Yes	No	No

U.K. (noun)	tearaway (noun)
a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom	a reckless and impetuous person

U.K. (adjective)	tearaway (adjective)
	characterized by undue haste and lack of thought or deliberation