fabrication vs old wives' tale

fabrication

noun
  • That which is fabricated; a falsehood 

  • The act of cutting up an animal carcass as preparation for cooking; butchery. 

  • The act of fabricating, framing, or constructing; construction; manufacture 

old wives' tale

noun
  • A supposed truth that has been passed down by word of mouth 

  • A rumour, myth or superstition; something which is almost certainly untrue, despite acceptance by many. 

How often have the words fabrication and old wives' tale occurred in a corpus of books? (source: Google Ngram Viewer )