intern vs Dr.

intern and Dr. both are nouns.

Word	Noun	Adjective	Verb	Adverb
intern	Yes	No	Yes	No
Dr.	Yes	No	No	No

As nouns, Dr. is a hypernym of intern; that is, Dr. is a word with a broader meaning than intern:

intern: an advanced student or graduate in medicine gaining supervised practical experience
Dr.: a licensed medical practitioner

Other hypernyms of intern include doc, doctor, MD, medico, physician.

intern (noun)	Dr. (noun)
an advanced student or graduate in medicine gaining supervised practical experience	a licensed medical practitioner
	a person who holds Ph.D. degree (or the equivalent) from an academic institution

intern (verb)	Dr. (verb)
deprive of freedom
work as an intern