onomatopoeia vs tropology

onomatopoeia

noun
  • A word that sounds like what it represents, such as "gurgle," "stutter," or "hiss". 

  • The use of language whose sound imitates that which it names. 

  • The property of a word of sounding like what it represents. 

  • A word that appropriates a sound for another sensation or a perceived nature, such as "thud", "beep", or "meow"; an ideophone, phenomime. 

tropology

noun
  • The use of a trope (metaphor or figure of speech). 

  • The interpretation of scripture or other work in order to educe moral or figurative meaning; a treatise of such interpretation. 

  • A recurring motif or metaphor, a trope; an interplay of tropes. 

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