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Noun killer has 4 senses
- 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|
- 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
- killer - a difficulty that is hard to deal with; "that exam was a real killer"
--3 is a kind of difficulty
- 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