endangered vs pigeon

endangered

adj
  • in danger, at risk, said of something where there is a strong possibility something bad will happen to it (for example, a species in danger of going extinct) 

pigeon

verb
  • To deceive with a confidence game. 

noun
  • One of several birds of the family Columbidae, which consists of more than 300 species. 

  • The meat from this bird. 

  • A person who is a target or victim of a confidence game. 

  • A person hired to transport film footage out of a region where transport options are limited. 

  • A weak or useless person. 

  • A pacifist, appeaser, an isolationist, a dove. 

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