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Synonyms for Killer (same or very similar meaning)

WordNet sense 1 (the causal agent resulting in death):
cause of death

WordNet sense 2 (someone who causes the death of a person or animal):
slayer

WordNet sense 3 (predatory black-and-white toothed whale with large dorsal fin; common in cold seas):
grampus, orca, killer whale, Orcinus orca, sea wolf


From the ODE community, based on WordNetadd/edit