house physician vs doc

house physician and doc both are nouns.

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

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

house physician: a physician (especially an intern) who lives in a hospital and cares for hospitalized patients under the supervision of the medical staff of the hospital
doc: a licensed medical practitioner

Other hypernyms of house physician include doctor, Dr., MD, medico, physician.

house physician (noun)	doc (noun)
a physician (especially an intern) who lives in a hospital and cares for hospitalized patients under the supervision of the medical staff of the hospital	a licensed medical practitioner