pannikin vs rummer

pannikin

noun
  • A durable cup or other vessel used for drinking made of metal and coated in enamel. 

  • The contents of such a vessel. 

rummer

noun
  • A large drinking-glass for alcoholic drinks, typically with a short or heavy stem. 

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