U.K. vs nark

U.K. and nark both are nouns.

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

U.K. (noun)	nark (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	an informer or spy working for the police
	a lawman concerned with narcotics violations

U.K. (verb)	nark (verb)
	inform or spy (for the police)
	cause annoyance in; disturb, especially by minor irritations