fairy story vs falsehood

fairy story

noun
  • Synonym of fairy tale (“story presented as true that is not believable”) 

  • Synonym of fairy tale (“folktale with fantasy characters”) 

falsehood

noun
  • A false statement, especially an intentional one; a lie. 

  • The property of being false. 

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