housemaid vs parlor maid

housemaid

verb
  • To be a housemaid. 

  • To wait on someone hand on foot, to watch them. 

noun
  • A housewife. 

  • A female domestic worker attached to the non-servant quarter part of the house, as opposed to a scullery maid. 

parlor maid

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