killer (n.)
- apache
- assassin
- assassinator
- beast
- beldam
- berserk
- berserker
- bomber
- bravo
- brute
- bully
- bullyboy
- butcher
- cannibal
- cutthroat
- daisy
- demon
- desperado
- devil
- dragon
- eradicator
- executioner
- exterminator
- fiend
- fire-eater
- firebrand
- fury
- garroter
- goon
- gorilla
- gun
- gunman
- hellcat
- hellhound
- hellion
- homicide
- hood
- hoodlum
- hooligan
- hothead
- hotspur
- humdinger
- incendiary
- lulu
- madcap
- man-eater
- manslayer
- matador
- monster
- mugger
- murderer
- pesticide
- poison
- poisoner
- rapist
- revolutionary
- rough
- rowdy
- ruffian
- savage
- slaughterer
- slayer
- spitfire
- strangler
- termagant
- terror
- terrorist
- thug
- tiger
- tigress
- torpedo
- tough
- virago
- vixen
- witch
- wolf