credit union vs banking concern

credit union and banking concern both are nouns.

Word	Noun	Adjective	Verb	Adverb
credit union	Yes	No	No	No
banking concern	Yes	No	No	No

As nouns, banking concern is a hypernym of credit union; that is, banking concern is a word with a broader meaning than credit union:

credit union: a cooperative depository financial institution whose members can obtain loans from their combined savings
banking concern: a financial institution that accepts deposits and channels the money into lending activities

Other hypernyms of credit union include bank, banking company, depository financial institution.

credit union (noun)	banking concern (noun)
a cooperative depository financial institution whose members can obtain loans from their combined savings	a financial institution that accepts deposits and channels the money into lending activities