refinement vs sophistication

refinement

noun
  • The act, or the result of refining; the removal of impurities, or a purified material 

  • A fine or subtle distinction. 

  • High-class style; cultivation. 

sophistication

noun
  • Falsification or contamination. 

  • Ability to deal with complexity. 

  • Enlightenment or education. 

  • Cultivated intellectual worldliness; savoir-faire. 

  • Deceptive logic; sophistry. 

  • Complexity. 

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