UK vs rag week

UK and rag week both are nouns.

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

UK (noun)	rag week (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 week at British universities during which side-shows and processions of floats are organized to raise money for charities