United Kingdom of Great Britain and Northern Ireland vs parliamentary agent

United Kingdom of Great Britain and Northern Ireland and parliamentary agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No
parliamentary agent	Yes	No	No	No

United Kingdom of Great Britain and Northern Ireland (noun)	parliamentary agent (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 person who is employed to look after the affairs of businesses that are affected by legislation of the British Parliament