royal charter vs Great Britain

royal charter and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
royal charter	Yes	No	No	No
Great Britain	Yes	No	No	No

royal charter (noun)	Great Britain (noun)
a charter granted by the sovereign (especially in Great Britain)	an island comprising England and Scotland and Wales
	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