saucepan vs waterpot

saucepan

noun
  • A deep cooking vessel with a handle and sometimes a lid; used for boiling, stewing and making sauces. 

verb
  • To cook in a saucepan 

waterpot

noun
  • A pot or jug for holding water. 

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