There are several synonyms for the phrase "father killing". One such term is patricide, which refers to the killing of one's own father. Another term for this act is parricide, which is the act of killing a close relative, such as a parent or sibling. Additionally, the phrase "maternal filicide" refers to the act of a mother killing her own child, while "avunculicide" is the killing of one's own uncle. It is important to note that any form of murder is considered a serious crime and can have severe legal and moral consequences, regardless of the familial relationship between the parties involved.