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killer

 
Noun killer has 4 senses
  1. killer, slayer - someone who causes the death of a person or animal
    --1 is a kind of person, individual, someone, somebody, mortal, human, soul
    --1 has particulars:
     executioner, public executioner; exterminator, terminator, eradicator; garroter, garrotter, strangler, throttler, choker; murderer, liquidator, manslayer; poisoner; regicide; suicide, felo-de-se
    Derived form: verb kill1
  2. cause of death, killer - the causal agent resulting in death; "heart disease is the biggest killer in the United States"
    --2 is a kind of causal agent, cause, causal agency
    Derived forms: verb kill1, verb kill3
  3. killer - a difficulty that is hard to deal with; "that exam was a real killer"
    --3 is a kind of
    difficulty
    Derived form: verb kill6
  4. killer whale, killer, orca, grampus, sea wolf, Orcinus orca - predatory black-and-white toothed whale with large dorsal fin; common in cold seas
    --4 is a kind of dolphin
    --4 is a member of Orcinus, genus Orcinus
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