Oppressor
From BiblePortal Wikipedia
King James Dictionary [1]
Oppress'Or, n. One that oppresses one that imposes unjust burdens on others one that harasses others with unjust laws or unreasonable severity.
Power when employed to relieve the oppressed and to punish the oppressor, becomes a great blessing.
Webster's Dictionary [2]
(n.) One who oppresses; one who imposes unjust burdens on others; one who harasses others with unjust laws or unreasonable severity.