cero vs moonfish

cero

noun
  • A large scombroid food fish (Scomberomorus regalis) found chiefly in the West Indies. 

moonfish

noun
  • The southern platyfish (Xiphophorus maculatus) 

  • Most species of genus Selene 

  • Family Monodactylidae (fingerfishes, silver angelfishes) 

  • The cusk (Brosme brosme), a North Atlantic cod-like fish in the ling family Lotidae, the only species in its genus. 

  • The opahs in the family Lamprididae. 

  • Atlantic spadefish (Chaetodipterus faber) 

  • Mene maculata, of tropical coastal waters of the Indo-Pacific 

  • Family Molidae (ocean sunfish) 

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