fish eagle vs osprey

fish eagle

noun
  • Any of several species of birds of prey that feed on fish in the genus Haliaeetus (syn. Ichthyophaga). 

  • The osprey (Pandion haliaetus). 

osprey

noun
  • A bird of prey (Pandion haliaetus) that feeds on fish and has white underparts and long, narrow wings each ending in four finger-like extensions. 

  • aigrette (ornamental feather) 

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