flea vs ladybug

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). 

ladybug

noun
  • Synonym of ladybird. 

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