reserve bank vs banking concern

reserve bank and banking concern both are nouns.

Word	Noun	Adjective	Verb	Adverb
reserve bank	Yes	No	No	No
banking concern	Yes	No	No	No

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

reserve bank: one of 12 regional banks that monitor and act as depositories for banks in their region
banking concern: a financial institution that accepts deposits and channels the money into lending activities

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

reserve bank (noun)	banking concern (noun)
one of 12 regional banks that monitor and act as depositories for banks in their region	a financial institution that accepts deposits and channels the money into lending activities