retraction vs utterance

retraction

noun
  • A continuous function from a topological space onto a subspace which is the identity on that subspace. 

  • An act or instance of retracting. 

  • A statement printed or broadcast in a public forum which effects the withdrawal of an earlier assertion, and which concedes that the earlier assertion was in error. 

utterance

noun
  • Something spoken. 

  • The ability to speak. 

  • A manner of speaking. 

  • An act of uttering. 

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