encouragement vs obstruction

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 

obstruction

noun
  • Something which obstructs or impedes, either intentionally or unintentionally 

  • The act of obstructing, or state of being obstructed. 

  • The condition of having the natural powers obstructed in their usual course; the arrest of the vital functions; death. 

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