encouraging vs promissory

encouraging

adj
  • giving courage, confidence or hope 

  • supporting by giving encouragement 

  • auspicious, or bringing good luck 

noun
  • encouragement 

promissory

adj
  • Containing or consisting of a promise. 

  • Stipulating the future actions required of the parties to an insurance policy or other business agreement. 

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