pay off vs bribe

pay off is not a noun while bribe is a noun.

Word	Noun	Adjective	Verb	Adverb
pay off	No	No	Yes	No
bribe	Yes	No	Yes	No

As verbs, bribe is a hypernym of pay off; that is, bribe is a word with a broader meaning than pay off:

Other hypernyms of pay off include buy, corrupt, grease one's palms.

pay off (noun)	bribe (noun)
	payment made to a person in a position of trust to corrupt his judgment

pay off (verb)	bribe (verb)
take vengeance on or get even	make illegal payments to in exchange for favors or influence
eliminate by paying off (debts)
pay someone with influence in order to receive a favor
yield a profit or result
pay off (loans or promissory notes)
do or give something to somebody in return