chamber pot vs slop bucket

chamber pot

noun
  • A container used for urination and defecation, particularly those used in early modern towns before the advent of the flush toilet. 

slop bucket

noun
  • A bucket used for urination and defecation: a chamber pot. 

  • A receptacle used to hold liquid waste. 

  • A pail used to hold food waste for disposal, e.g. by feeding to pigs. 

How often have the words chamber pot and slop bucket occurred in a corpus of books? (source: Google Ngram Viewer )