eradicator,
exterminator,
terminator someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects)
killer -
That which causes stress or is extremely difficult, especially that which may cause failure at a task.
killer -
Something that is so far ahead of its competition that it effectively kills off that competition.
killer -
A knockout form of darts involving several players.
killer -
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.