broadwing vs erne

broadwing

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

erne

noun
  • An eagle. 

  • A sea eagle (Haliaeetus), especially the white-tailed eagle (Haliaeetus albicilla) 

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