Cain
Judas
Mafioso
adherent
apache
assassin
assassinator
bandit
battler
belligerent
belted knight
betrayer
bickerer
blade
bloodletter
bloodshedder
bravo
brawler
brigand
bucko
bully
bullyboy
burker
butcher
button man
cannibal
combatant
competitor
contender
contestant
convict
creature
criminal
crook
cutthroat
dacoit
deceiver
desperado
desperate criminal
devil
disciple
disputant
double-dealer
duelist
dummy
enforcer
eradicator
executioner
exterminator
felon
malefactor
outlaw
burglar
conspirator
cop
gangster
hoodlum
kidnapper
killer
liar
mugger
rapist
robber
ruffian
scoundrel
smuggler
spy
thief
traitor
villain
whore
Bug
Doug
Lug
Zug
antidrug
bug
chug
debug
drug
dug
hug
jug
lug
mug
plug
pug
rug
shrug
slug
smug
snug
tug
ugh
unplug