mackinaw vs siscowet

mackinaw

noun
  • A flat-bottomed cargo boat; mackinaw boat. 

  • A heavy woolen cloth. 

  • A blanket made of wool, formerly distributed to the Amerindians by the U.S. government. 

siscowet

noun
  • A freshwater fish from Lake Superior in the Great Lakes, a variety of the lake trout. 

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