The word "patricidal" is used to describe someone who has killed their own father. However, there are several synonyms for this word that can be used in different contexts. One such synonym is "patricide," which is the act of killing one's father. Another synonym is "father-killer," which is a descriptive term that can be used to explain the act of patricide. Other synonyms for patricidal include "matricidal" (killing one's mother), "familicide" (killing one's family), and "parricide" (killing a close relative). These words all have different connotations and uses, but they all relate to the act of killing someone in one's family or close circle.