Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun killer

4 senses of killer

Sense 1
killer, slayer -- (someone who causes the death of a person or animal)
       => person, individual, someone, somebody, mortal, soul -- (a human being; "there was too much for one person to do")

Sense 2
cause of death, killer -- (the causal agent resulting in death; "heart disease is the biggest killer in the United States")
       => causal agent, cause, causal agency -- (any entity that produces an effect or is responsible for events or results)

Sense 3
killer -- (a difficulty that is hard to deal with; "that exam was a real killer")
       => difficulty -- (a factor causing trouble in achieving a positive result or tending to produce a negative result; "serious difficulties were encountered in obtaining a pure reagent")

Sense 4
killer whale, killer, orca, grampus, sea wolf, Orcinus orca -- (predatory black-and-white toothed whale with large dorsal fin; common in cold seas)
       => dolphin -- (any of various small toothed whales with a beaklike snout; larger than porpoises)