alliteration vs tropology

alliteration

noun
  • The repetition of consonant sounds at the beginning of two or more words immediately succeeding each other, or at short intervals. 

  • The recurrence of the same letter in accented parts of words, as in Anglo-Saxon alliterative meter. 

tropology

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

  • 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. 

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