broadwing vs buteo

broadwing

noun
  • In falconry, a bird of prey of the buzzard or eagle type, having long wings and long flight feathers. 

buteo

noun
  • Any of the broad-winged soaring raptors of the genus Buteo. 

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