backing vs promotion

backing

noun
  • The action of putting something back; a switching into reverse. 

  • Support, especially financial. 

  • A backdrop. 

  • The mounting of a horse or other animal. 

  • A liner or other material added behind or underneath. 

  • Musicians and vocalists who support the main performer. 

adj
  • Providing support for the main performer. 

promotion

noun
  • Forward motion. (Contrast remotion.) 

  • An event intended to increase the reach or image of a product or brand. 

  • Transformation of a pawn into a piece (by reaching the opponent's back rank). 

  • Dissemination of information in order to increase its popularity. 

  • An advancement in rank or position. 

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