regicide

Noun
  1. Someone who commits regicide;
    The killer of a king (synset 110536015)
    is a type of: killer, slayer - someone who causes the death of a person or animal
  2. The act of killing a king (synset 100225937)
    is a type of: execution, murder, slaying - unlawful premeditated killing of a human being by a human being

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