angelfish vs monkfish

angelfish

noun
  • A marine fish of the family Pomacanthidae, common on shallow tropical reefs. 

  • A freshwater fish, tropical cichlids of the genus Pterophyllum. 

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