genocidaire

noun2

1. •
   One who was involved in committing (perpetrating) the Rwandan Genocide.

   • When the RPF sent him and a friend back to school in Rwanda […] his friend attacked the Hutu teacher one night, strangling him with a rope, saying that he was a génocidaire. — 2011
2. •
   One who is involved in committing (perpetrating) any genocide.

   • What we must see, Rechtman argues, is that for genocidaires (those who carry out acts that are or approach genocide), there is nothing extraordinary, unusual, or world-historical about [their acts]. — 2021