bumblebee vs dragonfly

bumblebee

noun
  • Any of several species of large bee in the genus Bombus 

  • A mid yellow 

dragonfly

noun
  • An insect of the suborder Epiprocta or, more strictly, the infraorder Anisoptera, having four long transparent wings held perpendicular to a long body when perched. 

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