trigger man (?.)
- Cain
- apache
- assassin
- assassinator
- bloodletter
- bloodshedder
- bravo
- bruiser
- burker
- butcher
- button man
- cannibal
- cutthroat
- desperado
- eradicator
- executioner
- exterminator
- garroter
- goon
- gorilla
- gun
- gunman
- gunsel
- hatchet man
- head-hunter
- hellion
- hit man
- holy terror
- homicidal maniac
- homicide
- hood
- hoodlum
- hooligan
- killer
- man-eater
- man-killer
- manslayer
- massacrer
- matador
- mug
- mugger
- murderer
- muscle man
- pesticide
- plug-ugly
- poison
- poisoner
- rodman
- roughneck
- slaughterer
- slayer
- strangler
- strong-arm man
- terror
- thug
- torpedo
- tough
- ugly customer