houseman vs doc

houseman and doc both are nouns.

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

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

houseman: an advanced student or graduate in medicine gaining supervised practical experience
doc: a licensed medical practitioner

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

houseman (noun)	doc (noun)
an advanced student or graduate in medicine gaining supervised practical experience	a licensed medical practitioner