saucepan vs slow cooker

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 

slow cooker

noun
  • A kitchen appliance consisting of a clay pot and its housing with self-contained electrical heating, characterized by a loose-fitting lid, relatively low temperatures, and long cooking times, and used especially in the preparation of stews. 

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