fish eagle vs fishhawk

fish eagle

noun

  • The osprey (Pandion haliaetus). 

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

fishhawk

noun

  • The osprey. 

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