utterance vs vox populi

utterance

noun
  • Something spoken. 

  • The ability to speak. 

  • A manner of speaking. 

  • An act of uttering. 

vox populi

noun
  • voice of the people. 

  • The public comment portion of a public meeting. 

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