grant-in-aid vs postdoc

grant-in-aid and postdoc both are nouns.

Word	Noun	Adjective	Verb	Adverb
grant-in-aid	Yes	No	No	No
postdoc	Yes	No	No	No

As nouns, postdoc is a hyponym of grant-in-aid; that is, postdoc is a word with a more specific, narrower meaning than grant-in-aid:

Other hyponyms of grant-in-aid include post doc, postdoctoral.

grant-in-aid (noun)	postdoc (noun)
a grant from a central government to a local government	a scholar or researcher who is involved in academic study beyond the level of a doctoral degree
a grant to a person or school for some educational project	a grant that funds postdoctoral study or research