parody vs spoonerism

parody

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

verb
  • To make a parody of something. 

spoonerism

noun
  • A play on words on a phrase in which the initial (usually consonantal) sounds of two or more of the main words are transposed. 

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