United Kingdom of Great Britain and Northern Ireland vs lumber room

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

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

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