|Noah Webster's Dictionary|
1. (n.) One who deprives of life; one who, or that which, kills.
2. (n.) A voracious, toothed whale of the genus Orca, of which several species are known.
Killer (1 Occurrence)
Ezekiel 21:11 It is given to be furbished, that it may be handled: the sword, it is sharpened, yes, it is furbished, to give it into the hand of the killer. (WEB)