complication vs illustration

complication

noun
  • The act or process of complicating. 

  • 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. 

  • 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. 

illustration

noun
  • The act of illustrating; the act of making clear and distinct; 

  • A calculated prevision of insurance premiums and returns (life insurance) 

  • The state of being illustrated, or of being made clear and distinct. 

  • A picture designed to decorate a publication, or elucidate a literary work. 

  • Something which illustrates; a comparison or example intended to make clear or apprehensible, or to remove obscurity. 

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