7963. MASSACRE

✅ The correct answer is option D.
Murder : the unlawful premeditated killing of one human being by another.

Stab : thrust a knife or other pointed weapon into (someone) so as to wound or kill.

Assassinate : murder (an important person) for political or religious reasons.

Slaughter : kill (people or animals) in a cruel or violent way, typically in large numbers.

Massacre : an indiscriminate and brutal slaughter of many people.

Synonym of Massacre is Slaughter