payoff vs hush money

payoff and hush money both are nouns.

Word	Noun	Adjective	Verb	Adverb
payoff	Yes	No	No	No
hush money	Yes	No	No	No

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

payoff: payment made to a person in a position of trust to corrupt his judgment
hush money: a bribe paid to someone to insure that something is kept secret

Other hyponyms of payoff include kickback, payola, soap.

payoff (noun)	hush money (noun)
a recompense for worthy acts or retribution for wrongdoing	a bribe paid to someone to insure that something is kept secret
the final payment of a debt
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