pickerel vs strabismus

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. 

strabismus

noun
  • A defect of vision in which one eye cannot focus with the other on an object because of imbalance of the eye muscles; a squint. 

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