ersatz vs imitative

ersatz

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

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

imitative

adj
  • Imitating; copying; not original. 

  • Modelled after another thing. 

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