mom vs old woman

mom

noun
  • Mother. 

  • An adult female owner of a pet. 

verb
  • To care for in a motherly way. 

old woman

noun
  • One's mother. 

  • One's wife. 

  • An elderly woman. 

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

  • The plant sea wormwood. 

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