erne vs sea eagle

erne

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

  • An eagle. 

sea eagle

noun
  • An eagle with a distinctive white tail; specifically, the white-tailed eagle (Haliaeetus albicilla). 

  • A genus of eagles (genus Haliaeetus). 

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