base rate vs United Kingdom of Great Britain and Northern Ireland

base rate and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
base rate	Yes	No	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

base rate (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
the interest rate set by the Bank of England for lending to other banks	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