falcon vs sparrowhawk

falcon

noun
  • A female such bird, a male being a tiercel. 

  • Any bird of the genus Falco, all of which are birds of prey. 

  • A light cannon used from the 15th to the 17th century; a falconet. 

verb
  • To hunt with a falcon or falcons. 

sparrowhawk

noun
  • A female such bird, a male being a musket. 

  • Any of numerous other relatively small Old World species of Accipiter, that prey on smaller birds or otherwise resemble A. nisus. 

  • The Eurasian sparrowhawk, Accipiter nisus, a small, short-winged European hawk that preys on smaller birds. 

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