crustacean vs prawn

crustacean

noun
  • Any arthropod of the subphylum Crustacea, including lobsters, crabs, shrimp, barnacles and woodlice. 

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 crustacean and prawn occurred in a corpus of books? (source: Google Ngram Viewer )