Synonym of MASSACRE

Stab : thrust a knife or other pointed weapon into (someone) so as to wound or kill.
Slaughter : the killing of a large number of people or animals in a cruel or violent way.
Murder : the unlawful premeditated killing of one human being by another.
Assassinate : murder (an important person) for political or religious reasons.
Massacre : an indiscriminate and brutal slaughter of many people.

Synonym of Massacre is Slaughter