physician vs doc

physician and doc both are nouns.

Word	Noun	Adjective	Verb	Adverb
physician	Yes	No	No	No
doc	Yes	No	No	No

As nouns, physician and doc are synonyms defined as:

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

physician (noun)	doc (noun)
a licensed medical practitioner	a licensed medical practitioner