flea vs mosquito

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). 

mosquito

noun
  • A small flying insect of the family Culicidae, the females of which bite humans and animals and suck blood, leaving an itching bump on the skin, and sometimes carrying diseases like malaria and yellow fever. 

verb
  • To fly close to the ground, seemingly without a course. 

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