Something that is so far ahead of its competition that it effectively kills off that competition
You can refer to something that causes death or is likely to cause death as a killer. Heart disease is the biggest killer of men in most developed countries
predatory black-and-white toothed whale with large dorsal fin; common in cold seas
a difficulty that is hard to deal with; "that exam was a real killer" someone who causes the death of a person or animal
A double Back Somersault with 4 complete twists Also known as a Miller Plus, and a Poliarush (Dimitri Poliarush - BLR - Winner, 1996 World Championships)
a type of miniature bomb that attaches itself to living matter and explodes about 10 seconds later ("Gold")
the causal agent resulting in death; "heart disease is the biggest killer in the United States"
A diacritic mark used in Indic scripts to suppress an inherent vowel (e.g., the Hindi viram, the Bengali or Oriya hasanta) or render the entire syllable silent (e.g., the Burmese virama, the Khmer toandakhiat)
That which causes stress or is extremely difficult, especially that which may cause failure at a task