journalist vs reviewer

journalist

noun
  • A reporter, someone who professionally reports on news and current events. 

  • The keeper of a personal journal, who writes in it regularly. 

  • One whose occupation is journalism, originally only writing in the printed press. 

reviewer

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

  • An inspector. 

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