parricide

noun4

1. •
   The killing of a relative, especially a parent.
2. •
   The killing of a ruler, or other authority figure; treason.
3. •
   Someone who kills a relative, especially a parent.

   • I told him the reuenging Gods, / ’Gainst Paricides did all the thunder bend […] — 1603
4. •
   Someone who commits treason.