grouper vs red snapper

grouper

noun
  • Any of various large food and game fishes of the subfamily Epinephelinae, especially the genera Epinephelus and Mycteroperca, which inhabit warm seas. 

  • One who groups things. 

red snapper

noun
  • Any of several Atlantic foodfishes, of the genus Lutjanus, that have reddish bodies 

  • Rhomboplites aurorubens (vermillion snapper) 

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