lead bank vs banking company

lead bank and banking company both are nouns.

Word	Noun	Adjective	Verb	Adverb
lead bank	Yes	No	No	No
banking company	Yes	No	No	No

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

lead bank: a bank named by a lending syndicate of several banks to protect their interests
banking company: a financial institution that accepts deposits and channels the money into lending activities

Other hypernyms of lead bank include bank, banking concern, depository financial institution.

lead bank (noun)	banking company (noun)
a bank named by a lending syndicate of several banks to protect their interests	a financial institution that accepts deposits and channels the money into lending activities