sea crow vs sea raven

sea crow

noun

  • The cormorant. 

  • The Western jackdaw. 

  • The chough. 

  • The skua. 

  • The razorbill. 

  • The blackheaded pewit, and other gulls. 

  • The coot. 

sea raven

noun

  • The cormorant. 

  • Any fish in the family Hemitripteridae. 

  • An American cottoid fish, Hemitripterus americanus, allied to the sculpins. 

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