powwow vs symposium

powwow

noun
  • A short, private conference. 

  • A Native American council or meeting. 

  • A large gathering during which Indigenous songs and dances are showcased for an audience, essentially a recital or concert. Often also doubles as a fundraiser, or can be held in conjunction with a non-indigneous fair or exhibition in order to attract a large crowd, as at the Calgary Stampede and K-Days. 

  • A ritual conducted by a Native American shaman. 

  • A Native American shaman. 

verb
  • To conduct a ritual in which magic is used. 

  • To hold a private conference. 

  • To hold a meeting; to gather together in council. 

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 powwow and symposium occurred in a corpus of books? (source: Google Ngram Viewer )