Murderer

n.	1.	One guilty of murder; a person who, in possession of his reason, unlawfully kills a human being with premeditated malice.
	2.	A small cannon, formerly used for clearing a ship's decks of boarders; - called also murdering piece.

Noun

1.

murderer - a criminal who commits homicide (who performs the unlawful premeditated killing of another human being) Synonyms: liquidator, manslayer

Cain, apache, assassin, assassinator, bloodletter, bloodshedder, bravo, burker, butcher, button man, cannibal, cutthroat, desperado, eradicator, executioner, exterminator, garroter, gorilla, gun, gunman, gunsel, hatchet man, head-hunter, hit man, homicidal maniac, homicide, liquidator, man-eater, man-killer, manslayer, massacrer, matador, pesticide, poison, poisoner, slaughterer, strangler, thug, torpedo, trigger man