rag week vs United Kingdom of Great Britain and Northern Ireland

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

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

rag week (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
a week at British universities during which side-shows and processions of floats are organized to raise money for charities	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