encouragement vs promotion

encouragement

noun
  • Something that incites, supports, promotes, protects or advances; incentive 

  • Words or actions that increase someone's confidence 

  • The feeling of being encouraged 

  • The act of encouraging 

promotion

noun
  • 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. 

  • Forward motion. (Contrast remotion.) 

  • An advancement in rank or position. 

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