United Kingdom vs royal charter

United Kingdom and royal charter both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom	Yes	No	No	No
royal charter	Yes	No	No	No

United Kingdom (noun)	royal 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	a charter granted by the sovereign (especially in Great Britain)