falsity vs mistruth

falsity

noun
  • Something that is false; an untrue assertion. 

  • The falsity of that statement is easily proven. 

  • The characteristic of being untrue. 

mistruth

noun
  • Untruth; falsehood. 

  • A statement which, while technically true, is dishonestly misleading. 

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