satire vs spoonerism

satire

noun
  • A literary device of writing or art which principally ridicules its subject often as an intended means of provoking or preventing change or highlighting a shortcoming in the work of another. Humor, irony, and exaggeration are often used to aid this. 

  • A satirical work. 

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 satire and spoonerism occurred in a corpus of books? (source: Google Ngram Viewer )