Definitions of killer
  1. noun
    someone who causes the death of a person or animal
    synonyms: slayer
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    John Wilkes Booth
    United States actor and assassin of President Lincoln (1838-1865)
    Jack the Ripper
    an unidentified English murderer in the 19th century
    Lee Harvey Oswald
    United States assassin of President John F. Kennedy (1939-1963)
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    executioner, public executioner
    an official who inflicts capital punishment in pursuit of a warrant
    eradicator, exterminator, terminator
    someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects)
    choker, garroter, garrotter, strangler, throttler
    someone who kills by strangling
    liquidator, manslayer, murderer
    a criminal who commits homicide (who performs the unlawful premeditated killing of another human being)
    someone who kills with poison
    someone who commits regicide; the killer of a king
    felo-de-se, suicide
    a person who kills himself intentionally
    assassin, assassinator, bravo
    a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed
    a brutal indiscriminate murderer
    someone who murders by cutting the victim's throat
    an executioner who uses electricity to kill the condemned person
    a person who murders their brother or sister
    gun, gun for hire, gunman, gunslinger, hired gun, hit man, hitman, shooter, torpedo, triggerman
    a professional killer who uses a gun
    an executioner who hangs the condemned person
    hatchet man, iceman
    a professional killer
    headman, headsman
    an executioner who beheads the condemned person
    a person who murders an infant
    mass murderer
    a person who is responsible for the deaths of many victims in a single incident
    a woman murderer
    someone who kills his or her parent
    a murderer who slashes the victims with a knife
    serial killer, serial murderer
    someone who murders more than three victims one at a time in a relatively short interval
    type of:
    individual, mortal, person, somebody, someone, soul
    a human being
  2. noun
    the causal agent resulting in death
    “heart disease is the biggest killer in the United States”
    synonyms: cause of death
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    type of:
    causal agency, causal agent, cause
    any entity that produces an effect or is responsible for events or results
  3. noun
    a difficulty that is hard to deal with
    “that exam was a real killer
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    type of:
    a factor causing trouble in achieving a positive result or tending to produce a negative result
  4. noun
    predatory black-and-white toothed whale with large dorsal fin; common in cold seas
    synonyms: Orcinus orca, grampus, killer whale, orca, sea wolf
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    type of:
    any of various small toothed whales with a beaklike snout; larger than porpoises
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