complication vs jigsaw puzzle

complication

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

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

  • 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. 

jigsaw puzzle

noun
  • A type of puzzle in which the aim is to reconstruct a picture that has been cut (originally, with a jigsaw) into many small interlocking pieces. 

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