jack salmon vs pickerel

jack salmon

noun
  • A Chinook salmon that returns to the fresh water one or two years early. 

  • Sander vitreus. 

  • Sander canadensis. 

  • Merluccius productus, a ray-finned fish found in the northeast Pacific Ocean. 

pickerel

noun
  • A freshwater fish of the genus Esox. 

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

  • A wading bird, the dunlin. 

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