complication vs convolution

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. 

convolution

noun
  • The state or condition of being convoluted. 

  • One 360° turn in a spring or similar helix. 

  • A mathematical operation on two functions that produces a third that expresses how the shape of one is modified by the other; the integral of the product of the two functions after one is reflected about the y-axis and shifted along the x-axis. 

  • The shape of something rotating; a vortex. 

  • Any of the folds on the surface of the brain. 

  • A twist or fold. 

  • A function which maps a tuple of sequences into a sequence of tuples. 

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