forum vs symposium

forum

noun
  • A form of discussion involving a panel of presenters and often participation by members of the audience. 

  • A gathering for the purpose of discussion. 

  • A place for discussion. 

  • An Internet message board where users can post messages regarding one or more topics of discussion. 

  • A square or marketplace in a Roman town, used for public business and commerce. 

symposium

noun
  • A conference or other meeting for discussion of a topic, especially one in which the participants make presentations. 

  • A drinking party in Ancient Greece, especially one with intellectual discussion. 

  • A collection of essays, articles or papers on a particular subject by a number of contributors. 

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