falsehood vs untruth

falsehood

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

  • The property of being false. 

untruth

noun
  • A lie or falsehood. 

  • The condition of being false; truthlessness. 

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