dishwasher vs washer-dryer

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). 

washer-dryer

noun
  • A machine that combines a washing machine and clothes dryer. 

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