dishpan vs washbowl

dishpan

noun
  • A large basin or pan with a flat bottom in which dishes are washed. 

washbowl

noun
  • A sink in a bathroom, connected to a supply of water and a drain, in which one may wash one's face and hands. 

  • A basin for washing the face and hands; a washbasin. 

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