doctor-patient relation vs Dr.

doctor-patient relation and Dr. both are nouns.

Word	Noun	Adjective	Verb	Adverb
doctor-patient relation	Yes	No	No	No
Dr.	Yes	No	No	No

doctor-patient relation (noun)	Dr. (noun)
the responsibility of a physician to act in the best interests of the patient	a licensed medical practitioner
	a person who holds Ph.D. degree (or the equivalent) from an academic institution