United Kingdom of Great Britain and Northern Ireland vs rag day

United Kingdom of Great Britain and Northern Ireland and rag day both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No
rag day	Yes	No	No	No

United Kingdom of Great Britain and Northern Ireland (noun)	rag day (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 day on which university students hold a rag