enunciation vs utterance

enunciation

noun
  • Mode of utterance or pronunciation, especially as regards fullness and distinctness or articulation. 

  • That which is enunciated or announced; words in which a proposition is expressed; formal declaration 

  • The act of enunciating, announcing, proclaiming, or making known; open attestation; declaration. 

utterance

noun
  • The ability to speak. 

  • Something spoken. 

  • A manner of speaking. 

  • An act of uttering. 

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