PAYBACK
vengeance, retribution, payback
(noun) the act of taking revenge (harming someone in retaliation for something harmful that they have done) especially in the next life; “Vengeance is mine; I will repay, saith the Lord”--Romans 12:19; “For vengeance I would do nothing. This nation is too great to look for mere revenge”--James Garfield; “he swore vengeance on the man who betrayed him”; “the swiftness of divine retribution”
payback
(noun) financial return or reward (especially returns equal to the initial investment)
Source: WordNet® 3.1
Etymology
Noun
payback (usually uncountable, plural paybacks)
(uncountable) An act of revenge.
(countable) A benefit, reward, a form of recompense.
A return on investment
(rare) A refund, reimbursement
Synonyms
• just deserts
• poetic justice
Anagrams
• backpay
Source: Wiktionary