payment vs payoff

payment and payoff both are nouns.

Word	Noun	Adjective	Verb	Adverb
payment	Yes	No	No	No
payoff	Yes	No	No	No

As nouns, payoff is a hyponym of payment; that is, payoff is a word with a more specific, narrower meaning than payment:

payment: a sum of money paid or a claim discharged
payoff: payment made to a person in a position of trust to corrupt his judgment

payment (noun)	payoff (noun)
the act of paying money	a recompense for worthy acts or retribution for wrongdoing
an act of requiting; returning in kind	the final payment of a debt
a sum of money paid or a claim discharged	payment made to a person in a position of trust to corrupt his judgment
	the income or profit arising from such transactions as the sale of land or other property