post doc vs scholar

post doc and scholar both are nouns.

Word	Noun	Adjective	Verb	Adverb
post doc	Yes	No	No	No
scholar	Yes	No	No	No

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

post doc: a scholar or researcher who is involved in academic study beyond the level of a doctoral degree
scholar: a learned person; someone who by long study has gained mastery in one or more disciplines

Other hypernyms of post doc include investigator, research worker, researcher, bookman, scholarly person.

post doc (noun)	scholar (noun)
a scholar or researcher who is involved in academic study beyond the level of a doctoral degree	a learned person; someone who by long study has gained mastery in one or more disciplines
a grant that funds postdoctoral study or research	someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs
	a student who holds a scholarship