נָקַם
From LSJ
Ἤθη πονηρὰ τὴν φύσιν διαστρέφει → Bonae indolis venena sunt mores mali → Verdorbne Sitten sind verderblich der Natur
English (Strong)
a primitive root; to grudge, i.e. avenge or punish: avenge(-r, self), punish, revenge (self), X surely, take vengeance.