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

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

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

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