kestrel vs vulture

kestrel

noun
  • Any of various small falcons of the genus Falco that hover while hunting. 

  • The common kestrel, Falco tinnunculus. 

vulture

noun
  • Any of several carrion-eating birds of the families Accipitridae and Cathartidae. 

  • A person who profits from the suffering of others. 

verb
  • To circle around one's target as if one were a vulture. 

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