cleg vs pest

cleg

noun
  • A blood-sucking fly of the family Tabanidae; a gadfly, a horsefly. 

  • A light breeze. 

pest

noun
  • Any destructive insect that attacks crops or livestock; an agricultural pest. 

  • An animal regarded as a nuisance, destructive, or a parasite, vermin. 

  • An annoying person, a nuisance. 

  • An invasive weed. 

How often have the words cleg and pest occurred in a corpus of books? (source: Google Ngram Viewer )