friar vs monkfish

friar

noun
  • An American fish, the silverside. 

  • A member of a mendicant Christian order such as the Augustinians, Carmelites (white friars), Franciscans (grey friars) or the Dominicans (black friars). 

monkfish

noun
  • Any large bottom-dwelling anglerfish of the genus Lophius, such as Lophius piscatorius, of the Atlantic, having a large head and mouth. 

  • Angel sharks of the genus Squatina. 

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