Persecutor has a negative meaning, implying the person is unjust and mean. The dictator was seen as a persecutor by the oppressed citizens.
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Power Imbalance
Often suggests a power imbalance; a persecutor is usually seen as more powerful. In history class, we learned about the persecutors who led witch hunts.
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Cultural Sensitivity
Using this word can carry historical & cultural weight, especially in discussions about discrimination. Activists work hard to stop persecutors who target marginalized communities.