overseer vs reviewer

overseer

noun
  • An officer responsible for the care of the poor, making out lists of voters and those who had not paid taxes, etc. 

  • The manager of a plantation of slaves. 

reviewer

noun
  • An inspector. 

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

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