bulletin vs third class

bulletin

noun
  • A short printed publication, especially one produced regularly by an organization. 

  • A short report, especially one released through official channels to be immediately broadcast or publicized. 

  • A news item or short news report. 

verb
  • To announce something by means of such a report or publication. 

intj
  • Introduces an obvious fact of which the person addressed is ostensibly not aware. 

third class

noun
  • A reduced-rate mail service for printed matter. 

  • The cheapest accommodation on a train or ship. 

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