| English noun: killer | 
| 1. | killer (person) someone who causes the death of a person or animal | 
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 | Synonyms | slayer | 
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 | Broader (hypernym) | individual, mortal, person, somebody, someone, soul | 
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 | Narrower (hyponym) | choker, eradicator, executioner, exterminator, felo-de-se, garroter, garrotter, liquidator, manslayer, murderer, poisoner, public executioner, regicide, strangler, suicide, terminator, throttler | 
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| 2. | killer (state) the causal agent resulting in death | 
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 | Samples | Heart disease is the biggest killer in the United States. 
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 | Synonyms | cause of death | 
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 | Broader (hypernym) | causal agency, causal agent, cause | 
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| 3. | killer (cognition) a difficulty that is hard to deal with | 
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 | Samples | That exam was a real killer. 
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 | Broader (hypernym) | difficulty | 
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| 4. | killer (animal) predatory black-and-white toothed whale with large dorsal fin; common in cold seas | 
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 | Synonyms | grampus, killer whale, orca, Orcinus orca, sea wolf | 
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 | Broader (hypernym) | dolphin | 
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 | Member meronym | genus Orcinus, Orcinus | 
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