mug vs U.K.

mug and U.K. both are nouns.

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

mug (noun)	U.K. (noun)
with handle and usually cylindrical	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
the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British)
a person who is gullible and easy to take advantage of
the quantity that can be held in a mug

mug (verb)	U.K. (verb)
To stare awkwardly
rob at gunpoint or with the threat of violence