charlady vs home help

charlady

noun
  • A woman who cleans houses and offices as an occupation. 

home help

noun
  • A person employed, especially by a social services department, to perform household chores and provide aid to a patient or infirm person in the latter's own home; a carer. 

  • The aid provided by such people. 

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