poor rates vs United Kingdom of Great Britain and Northern Ireland

poor rates and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
poor rates	Yes	No	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

poor rates (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
a local tax for the relief of the poor	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