United Kingdom of Great Britain and Northern Ireland vs The Great Charter

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

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

United Kingdom of Great Britain and Northern Ireland (noun)	The Great Charter (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 royal charter of political rights given to rebellious English barons by King John in 1215