Great Britain vs rag week

Great Britain and rag week both are nouns.

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

Great Britain (noun)	rag week (noun)
an island comprising England and Scotland and Wales	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