falsehood vs falsity

falsehood

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

  • The property of being false. 

falsity

noun
  • Something that is false; an untrue assertion. 

  • The falsity of that statement is easily proven. 

  • The characteristic of being untrue. 

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