1) Assassin 2) Assassinator 3) Bravo 4) Fratricide 5) Gunman 6) Gunslinger 7) Hitman 8) Infanticide 9) Liquidator 10) Murderer 11) Murderess 12) Parricide 13) Ripper 14) Torpedo 15) Triggerman 1) Criminal 2) Crook 3) Felon 4) Homicide 5) Killer 6) Liquidator 7) Malefactor 8) Murderer 9) Outlaw 10) Slayer 
• (n.) One who kills a human being; one who commits manslaughter.
Man'slay`er noun One who kills a human being; one who commits manslaughter.