authentic vs ersatz

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. 

ersatz

adj
  • Made in imitation; artificial, especially of a poor quality. 

noun
  • Something made in imitation; an effigy or substitute. 

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