double meaning vs spoonerism

double meaning

noun
  • A deliberate construction that plays on two separate meanings of a word or words; a pun. 

  • The situation in which a word or phrase has two different, often opposite, meanings. For example, wicked can mean both "good" and "bad". 

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