Great Britain vs parliamentary agent

Great Britain and parliamentary agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
parliamentary agent	Yes	No	No	No

Great Britain (noun)	parliamentary agent (noun)
an island comprising England and Scotland and Wales	a person who is employed to look after the affairs of businesses that are affected by legislation of the British Parliament
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