leucoma vs pickerel

leucoma

noun
  • An opaque area or scar on the cornea of an eye 

pickerel

noun
  • Walleye, A species of gamefish, Sander vitreus, native to the Northern U.S. and Canada with pale, reflective eyes. 

  • A freshwater fish of the genus Esox. 

  • A wading bird, the dunlin. 

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