old woman vs queen mother

old woman

noun
  • One's wife. 

  • One's mother. 

  • An elderly woman. 

  • A person (irrespective of age or sex) who is always complaining about his or her situation. 

  • The plant sea wormwood. 

queen mother

noun
  • A widowed queen consort (a queen dowager) whose son or daughter from that marriage is the reigning monarch. 

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