crawfish vs prawn

crawfish

noun
  • Various freshwater crustaceans, crayfish. 

  • Various marine crustaceans, rock lobster; especially Jasus lalandii, the Cape crawfish. 

  • A slur against Anglo-Canadians used in some corners of Quebec (including the Gaspé). 

verb
  • To backpedal, desert or withdraw (also used with out). 

prawn

noun
  • A crustacean, sometimes confused with shrimp. 

  • A crustacean of the suborder Dendrobranchiata. 

  • A fool, an idiot. 

  • Synonym of butterface: A woman with an attractive body but an unattractive face. 

verb
  • To fish for prawns. 

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