money handler vs payer

money handler and payer both are nouns.

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

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

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

money handler (noun)	payer (noun)
a person who receives or invests or pays out money	a person who pays money for something