angler vs monkfish

angler

noun
  • An angler fish, Lophius piscatorius. 

  • A person who fishes with a hook and line. 

  • Someone who tries to work an angle; a person who schemes or has an ulterior motive. 

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 angler and monkfish occurred in a corpus of books? (source: Google Ngram Viewer )