brazier vs cauldron

brazier

noun
  • An upright standing or hanging metal bowl used for holding burning coal for a source of light or heat. 

  • A worker in brass. 

cauldron

noun
  • A large bowl-shaped pot used for boiling over an open flame. 

  • A strategic encirclement. 

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