dishwasher vs washing mitt

dishwasher

noun
  • A machine for washing dishes. 

  • A European bird, the wagtail. 

  • Someone who washes dishes, especially one hired to wash dishes in a restaurant. 

  • A bird, the restless flycatcher (Myiagra inquieta). 

washing mitt

noun
  • A mitt-shaped piece of terrycloth used for personal hygiene. 

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