cantilever vs mainstay

cantilever

noun
  • A beam anchored at one end and used as a lever within a microelectromechanical system. 

  • A beam anchored at one end and projecting into space, such as a long bracket projecting from a wall to support a balcony. 

  • A technique, similar to the spread eagle, in which the skater travels along a deep edge with knees bent and bends their back backwards, parallel to the ice. 

verb
  • To project (something) in the manner of or by means of a cantilever. 

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 cantilever and mainstay occurred in a corpus of books? (source: Google Ngram Viewer )