payback vs vengeance

payback and vengeance both are nouns.

Word	Noun	Adjective	Verb	Adverb
payback	Yes	No	No	No
vengeance	Yes	No	No	No

As nouns, payback and vengeance are synonyms defined as:

payback and vengeance: the act of taking revenge (harming someone in retaliation for something harmful that they have done) especially in the next life

Other synonyms of payback include retribution.

payback (noun)	vengeance (noun)
the act of taking revenge (harming someone in retaliation for something harmful that they have done) especially in the next life	the act of taking revenge (harming someone in retaliation for something harmful that they have done) especially in the next life
financial return or reward (especially returns equal to the initial investment)