kedge vs mainstay

kedge

noun
  • A small anchor used for warping a vessel. 

  • A glutton. 

verb
  • To move with the help of a kedge, as described above. 

  • To warp (a vessel) by carrying out a kedge in a boat, dropping it overboard, and hauling the vessel up to it. 

mainstay

noun
  • A stabilising rope from the top of the mainmast to the bottom of the foremast. 

  • Someone or something that can be depended on to make a regular contribution. 

  • A chief support. 

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