Etymology
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persecutor (n.)

early 15c., persecutour, "one who pursues and harasses another unjustly and vexatiously," especially "a persecutor of Christians, an oppressor (of the Church or Christians)," from Anglo-French persecutour, Old French persecutor "persecutor, enemy" (12c., Modern French persécuteur) and directly from Latin persecutor, agent noun from persequi (see persecution). 

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Definitions of persecutor

persecutor (n.)
someone who torments;
Synonyms: tormentor / tormenter
From wordnet.princeton.edu