butter dish vs cauldron

butter dish

noun
  • A specialised dish for serving butter. It typically has a base with a separate fitting lid with its own handle. 

cauldron

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

  • A strategic encirclement. 

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