encouragement vs fettering

encouragement

noun
  • Words or actions that increase someone's confidence 

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

  • The feeling of being encouraged 

  • The act of encouraging 

fettering

noun
  • The act by which something is fettered or constricted. 

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