imitate vs parody

imitate

verb
  • To follow as a model or a pattern; to make a copy, counterpart or semblance of. 

parody

verb
  • To make a parody of something. 

noun
  • A work or performance that imitates another work or performance with ridicule or irony. 

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