lumber room vs United Kingdom of Great Britain and Northern Ireland

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

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

lumber room (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
a storeroom in a house where odds and ends can be stored (especially furniture)	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