alliteration vs litotes

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. 

litotes

noun
  • An ironic figure of speech whereby something is stated by denying its opposite, particularly the negation of a negative quality to say something positive. 

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