United Kingdom of Great Britain and Northern Ireland vs Military Intelligence Section 5

United Kingdom of Great Britain and Northern Ireland and Military Intelligence Section 5 both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No
Military Intelligence Section 5	Yes	No	No	No

United Kingdom of Great Britain and Northern Ireland (noun)	Military Intelligence Section 5 (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 government agency in the United Kingdom that is responsible for internal security and counterintelligence on British territory