rag week vs Britain

rag week and Britain both are nouns.

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

rag week (noun)	Britain (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