aposiopesis vs figure of speech

aposiopesis

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

figure of speech

noun
  • A word or phrase that departs from straightforward, literal language. 

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