perspicuity vs sagacity

perspicuity

noun
  • Perspicacity; insight. 

  • Transparency; translucence. 

  • Clarity, lucidity, especially in expression; the state or characteristic of being perspicuous. 

sagacity

noun
  • The quality of being sage, wise, or able to make good decisions; the quality of being perceptive, astute or insightful. 

  • See Thesaurus:wisdom 

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