U.K. vs medical intern

U.K. and medical intern both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.K.	Yes	No	No	No
medical intern	Yes	No	No	No

U.K. (noun)	medical intern (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	an advanced student or graduate in medicine gaining supervised practical experience