United Kingdom of Great Britain and Northern Ireland vs shire town

United Kingdom of Great Britain and Northern Ireland and shire town both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No
shire town	Yes	No	No	No

United Kingdom of Great Britain and Northern Ireland (noun)	shire town (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	the town or city that is the seat of government for a county