bagwash vs bathtub

bagwash

noun
  • A type of laundry in which the washing was returned to the customer in a bag, undried and unpressed. 

bathtub

noun
  • A large container for holding water in which a person may bathe (take a bath). 

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