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
killer
liquidator
lyncher
man-eater
man-killer
manslayer
massacrer
matador
pesticide
poison
poisoner
slaughterer
slayer
strangler
thug
torpedo
trigger man
murdering piece
criminal
crook
felon
malefactor
outlaw
Jack the Ripper
fratricide
gun for hire
gunslinger
hired gun
iceman
infanticide
mass murderer
murderess
parricide
ripper
serial killer
serial murderer
shooter
triggerman
murder
adventurer
beggar
burglar
foe
gambler
liar
monster
offender
pirate
rapist
rebel
ruffian
scoundrel
spy
thief
traitor
tyrant
victim
villain
wretch