mackinaw vs topcoat

mackinaw

noun
  • A heavy woolen cloth. 

  • A flat-bottomed cargo boat; mackinaw boat. 

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

topcoat

noun
  • A layer of paint or varnish etc. applied after the undercoat. 

  • A light overcoat. 

verb
  • To apply a topcoat to. 

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