rag week vs Great Britain

rag week and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
rag week	Yes	No	No	No
Great Britain	Yes	No	No	No

rag week (noun)	Great Britain (noun)
a week at British universities during which side-shows and processions of floats are organized to raise money for charities	an island comprising England and Scotland and Wales
	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