MURDERER
murderer, liquidator, manslayer
(noun) a criminal who commits homicide (who performs the unlawful premeditated killing of another human being)
Source: WordNet® 3.1
Etymology
Noun
murderer
A person who commits murder.
Synonyms
• See also killer
Coordinate terms
• murderess
Anagrams
• demurrer
Source: Wiktionary
Mur"der*er, 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. [Obs.]
Source: Webster’s Unabridged Dictionary 1913 Edition