medical specialist vs doc

medical specialist and doc both are nouns.

Word	Noun	Adjective	Verb	Adverb
medical specialist	Yes	No	No	No
doc	Yes	No	No	No

As nouns, doc is a hypernym of medical specialist; that is, doc is a word with a broader meaning than medical specialist:

Other hypernyms of medical specialist include doctor, Dr., MD, medico, physician.

medical specialist (noun)	doc (noun)
practices one branch of medicine	a licensed medical practitioner