healer vs medicine woman

healer

noun
  • One who heals, especially through faith. 

  • Anything that heals; a medicine that heals some wound, injury, ailment, or disease. 

medicine woman

noun
  • A female Native American (or, any other indigenous) shamanistic healer. 

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