killer

/kˈɪlɝ/

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Definitions

Noun
someone who causes the death of a person or animal
Noun
the causal agent resulting in death; "heart disease is the biggest killer in the United States"
Noun
a difficulty that is hard to deal with; "that exam was a real killer"
Noun
predatory black-and-white toothed whale with large dorsal fin; common in cold seas