flea vs fruit fly

flea

noun
  • A small, wingless, parasitic insect of the order Siphonaptera, renowned for its bloodsucking habits and jumping abilities. 

  • A thing of no significance. 

verb
  • To remove fleas from (an animal). 

fruit fly

noun
  • any insect of the Tephritidae family, whose larvae damage plant tissue. 

  • any insect of the Drosophilidae family, whose larvae feed on ripening fruit, especially the species Drosophila melanogaster that is used in genetic research. 

  • A woman who enjoys the company of homosexual men; a "fag hag". 

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