beluga vs cod

beluga

noun
  • A fish found in the Caspian Sea and the Black Sea (Huso huso), that is a source of caviar. 

  • A cetacean, Delphinapterus leucas, found in the Arctic Ocean. 

cod

noun
  • The meat of any of the above fish 

  • The Atlantic cod, Gadus morhua. 

  • The cocoon of a silkworm. 

  • Other not closely related fish which are similarly important to regional fisheries, as the hapuku and cultus cod. 

  • The sea fish of the family Gadidae which are sold as "cod", as haddock (Melanogrammus aeglefinus) and whiting (usually Merlangius merlangus). 

  • A joke or an imitation. 

  • Other not closely related fish which resemble the Atlantic cod, as the rock cod (Lotella rhacina) and blue cod (Parapercis colias). 

  • A stupid or foolish person. 

  • The sea fish of the genus Gadus generally, as inclusive of the Pacific cod (Gadus macrocephalus) and Greenland cod (Gadus ogac or Gadus macrocephalus ogac). 

verb
  • To attempt to deceive or confuse; To joke; To kid. 

adj
  • Bad. 

  • Having the character of imitation; jocular. 

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