killer

nouns

someone who causes the death of a person or animal
killer, slayer
is derived from
kill
the causal agent resulting in death
"heart disease is the biggest killer in the United States"
cause of death, killer
is derived from
kill
is derived from
kill
a difficulty that is hard to deal with
"that exam was a real killer"
killer
is derived from
kill
is a type of (narrower)
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"
difficulty
predatory black-and-white toothed whale with large dorsal fin; common in cold seas
Orcinus orca, grampus, killer, killer whale, orca, sea wolf