complication vs intricacy

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. 

intricacy

noun
  • The state or quality of being intricate or entangled. 

  • Something which is intricate or complex. 

  • Perplexity 

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