United Kingdom of Great Britain and Northern Ireland vs Special Branch

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

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

United Kingdom of Great Britain and Northern Ireland (noun)	Special Branch (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 government police department dealing with political security