charwoman vs housemaid

charwoman

noun
  • A woman employed to do housework, traditionally coming and going on a daily basis and paid weekly wages. 

housemaid

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

  • A housewife. 

verb
  • To be a housemaid. 

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

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