fairy tale vs untruth

fairy tale

noun
  • A story presented as true that is not believable. 

  • A delightful and ideal situation of a kind attained by very few. 

  • A folktale featuring fairies or similar fantasy characters. 

untruth

noun
  • The condition of being false; truthlessness. 

  • A lie or falsehood. 

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