declination vs turndown

declination

noun
  • A refusal. 

  • At a given point, the angle between magnetic north and true north. 

  • At a given point, the angle between the line connecting this point with the geographical center of the earth and the equatorial plane. 

turndown

noun
  • A rejection. 

  • The operational range of a device 

  • A downturn. 

  • A downward pointing extension to a vehicle muffler. 

  • The service of turning down the bedcovers and often leaving chocolates, etc., on the pillow. 

adj
  • Made to wear with the upper part turned down. 

  • Capable of being turned down, or decreased in intensity. 

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