cauldron vs plaw

cauldron

noun

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

  • A strategic encirclement. 

plaw

noun

  • A boiling. 

verb

  • To boil; seethe. 

  • To boil; boil slightly; parboil. 

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