alliteration vs aposiopesis

alliteration

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

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

aposiopesis

noun
  • An abrupt breaking-off in speech, often indicated in print using an ellipsis (…) or an em dash (—). 

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