United Kingdom of Great Britain and Northern Ireland vs plain flour

United Kingdom of Great Britain and Northern Ireland and plain flour both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No
plain flour	Yes	No	No	No

United Kingdom of Great Britain and Northern Ireland (noun)	plain flour (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	flour that does not contain a raising agent