United Kingdom of Great Britain and Northern Ireland vs Battle of Britain

United Kingdom of Great Britain and Northern Ireland and Battle of Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No
Battle of Britain	Yes	No	No	No

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