slop-basin vs slop-bowl

slop-basin

noun
  • A bowl for receiving the leavings of tea or coffee cups at table 

slop-bowl

noun
  • Part of a traditional tea set, used to empty the cold tea and dregs in tea cups before refilling with hot tea. Usually pottery or silver. 

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