Battle of Britain vs UK

Battle of Britain and UK both are nouns.

Word	Noun	Adjective	Verb	Adverb
Battle of Britain	Yes	No	No	No
UK	Yes	No	No	No

Battle of Britain (noun)	UK (noun)
the prolonged bombardment of British cities by the German Luftwaffe during World War II and the aerial combat that accompanied it	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