aposiopesis vs metonymy

aposiopesis

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

metonymy

noun
  • The use of a single characteristic or part of an object, concept or phenomenon to identify the entire object, concept, phenomenon or a related object. 

  • A metonym. 

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