Dr. vs doc

Dr. and doc both are nouns.

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

As nouns, Dr. and doc are synonyms defined as:

Other synonyms of Dr. include doctor, MD, medico, physician.

Dr. (noun)	doc (noun)
a licensed medical practitioner	a licensed medical practitioner
a person who holds Ph.D. degree (or the equivalent) from an academic institution