aphorism vs spoonerism

aphorism

noun
  • A concise, terse, laconic, or memorable expression of a general truth or principle. 

verb
  • To speak or write aphorisms. 

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