authentic vs tacit

authentic

adj
  • Conforming to reality and therefore worthy of trust, reliance, or belief. 

  • Of the same origin as claimed; genuine. 

  • Having the final as the lowest note of the mode. 

tacit

adj
  • Implied, but not made explicit, especially through silence. 

  • Not derived from formal principles of reasoning; based on induction rather than deduction. 

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