kickback vs bribe

kickback and bribe both are nouns.

Word	Noun	Adjective	Verb	Adverb
kickback	Yes	No	No	No
bribe	Yes	No	Yes	No

As nouns, bribe is a hypernym of kickback; that is, bribe is a word with a broader meaning than kickback:

kickback: a commercial bribe paid by a seller to a purchasing agent in order to induce the agent to enter into the transaction
bribe: payment made to a person in a position of trust to corrupt his judgment

Other hypernyms of kickback include payoff.

kickback (noun)	bribe (noun)
a commercial bribe paid by a seller to a purchasing agent in order to induce the agent to enter into the transaction	payment made to a person in a position of trust to corrupt his judgment

kickback (verb)	bribe (verb)
	make illegal payments to in exchange for favors or influence