complication vs encouragement

complication

noun
  • A person who doesn't fit in with the main scheme of things; an interloper. 

  • The state of being complicated; intricate or confused relation of parts; complexity. 

  • The act or process of complicating. 

  • A feature beyond basic time display in a timepiece. 

  • A disease or diseases, or adventitious circumstances or conditions, coexistent with and modifying a primary disease, but not necessarily connected with it. 

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 

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