deer fly vs plague

deer fly

noun
  • A Eurasian species of louse fly in the family Hippoboscidae, Lipoptena cervi; parasites of elk, deer and other bovine animals, sucking blood and laying eggs in the fur of the host animals. 

  • A gold- or green-eyed horsefly of the genus Chrysops in the family Tabanidae; pests to cattle, horses and humans, feeding on their blood. 

plague

noun
  • The bubonic plague, the pestilent disease caused by the virulent bacterium Yersinia pestis. 

  • A group of common grackles. 

  • A widespread affliction, calamity or destructive influx, especially when seen as divine retribution. 

  • An epidemic or pandemic caused by any pestilence, but specifically by the above disease. 

  • A grave nuisance, whatever greatly irritates. 

verb
  • To harass, pester or annoy someone persistently or incessantly. 

  • To afflict with a disease or other calamity. 

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