money handler vs banker

money handler and banker both are nouns.

Word	Noun	Adjective	Verb	Adverb
money handler	Yes	No	No	No
banker	Yes	No	No	No

As nouns, banker is a hyponym of money handler; that is, banker is a word with a more specific, narrower meaning than money handler:

Other hyponyms of money handler include drawer, exchanger, money changer, payer, remunerator, redeemer, financial officer, treasurer.

money handler (noun)	banker (noun)
a person who receives or invests or pays out money	a financier who owns or is an executive in a bank
	the person in charge of the bank in a gambling game