Killer meaning

noun

1. someone who causes the death of a person or animal

   Synonymsslayer

2. the causal agent resulting in death

   “heart disease is the biggest killer in the United States”

   Synonymscause of death

3. a difficulty that is hard to deal with

   “that exam was a real killer”

4. predatory black-and-white toothed whale with large dorsal fin; common in cold seas

   Synonymskiller whaleorcagrampussea wolfOrcinus orca