U.K. vs gin mill

U.K. and gin mill both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.K.	Yes	No	No	No
gin mill	Yes	No	No	No

U.K. (noun)	gin mill (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	tavern consisting of a building with a bar and public rooms; often provides light meals