Cain
Nimrod
adventurer
apache
archer
artilleryman
assassin
assassinator
bloodletter
bloodshedder
bowman
bravo
bucko
bully
bullyboy
burker
butcher
button man
cannibal
cannoneer
carabineer
condottiere
crack shot
cutthroat
dead shot
deadeye
desperado
devil
eradicator
executioner
exterminator
free lance
garroter
good shot
gorilla
gun
gunner
gunsel
gunslinger
hatchet man
head-hunter
hell-raiser
hellcat
hired gun
hired killer
hireling
hit man
homicidal maniac
homicide
hunter
liquidator
manslayer
murderer
shooter
shot
attacker
attackers
bandit
brigand
crewman
hijacker
kidnapper
thug