English to English

noun (n)

• a persistently annoying person(noun.person)

  Synonym:
  blighter, cuss, pest, pesterer
  

  source: wordnet30
• any of various large flies that annoy livestock(noun.animal)

  source: wordnet30
• Any dipterous insect of the genus Oestrus, and allied genera of botflies.(noun)

  source: webster1913