fourth estate vs publicist

fourth estate

noun
  • Journalism or journalists considered as a group; the press. 

publicist

noun
  • A journalist, often a commentator, who focusses on politics 

  • A person whose job is to publicize information or events; a publicity agent; a public relations agent or worker 

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