catchment vs slop bucket

catchment

noun
  • Any structure or land feature which catches and holds water; the collection of such water. 

  • A catchment area, or the people it serves. 

verb
  • To divide into catchment areas. 

slop bucket

noun
  • A receptacle used to hold liquid waste. 

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

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

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