wash-hand basin vs washbowl

wash-hand basin

washbowl

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

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

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