Great Britain vs royal charter

Great Britain and royal charter both are nouns.

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

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