auditor vs reviewer

auditor

noun
  • One who audits bookkeeping accounts. 

  • One who audits an academic course; who attends the lectures but does not earn academic credit. 

  • One who listens, typically as a member of an audience. 

  • One trained to perform spiritual guidance procedures. 

  • In many jurisdictions, an elected or appointed public official in charge of the public accounts; a comptroller. 

reviewer

noun
  • A person who writes reviews for a newspaper or other publication; a critic. 

  • An inspector. 

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