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One, such as a person or animal, that kills a human.
a person who kills people
a person who kills another human.
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|Noun||1.||manslayer - a criminal who commits homicide (who performs the unlawful premeditated killing of another human being)|
assassin, assassinator, bravo - a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed; "his assassins were hunted down like animals"; "assassinators of kings and emperors"
butcher - a brutal indiscriminate murderer
criminal, crook, felon, malefactor, outlaw - someone who has committed a crime or has been legally convicted of a crime
cutthroat - someone who murders by cutting the victim's throat
fratricide - a person who murders their brother or sister
gun for hire, gunman, gunslinger, hired gun, hit man, hitman, torpedo, triggerman, gun, shooter - a professional killer who uses a gun
infanticide - a person who murders an infant
mass murderer - a person who is responsible for the deaths of many victims in a single incident
murderess - a woman murderer
parricide - someone who kills his or her parent
ripper - a murderer who slashes the victims with a knife; "Jack the Ripper was probably a madman"