U.K. vs bagatelle

U.K. and bagatelle both are nouns.

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

U.K. (noun)	bagatelle (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 table game in which short cues are used to knock balls into holes that are guarded by wooden pegs; penalties are incurred if the pegs are knocked over
	something of little value or significance
	a light piece of music for piano