postdoc vs grant-in-aid

postdoc and grant-in-aid both are nouns.

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

As nouns, grant-in-aid is a hypernym of postdoc; that is, grant-in-aid is a word with a broader meaning than postdoc:

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