falsity vs truism

falsity

noun
  • The falsity of that statement is easily proven. 

  • The characteristic of being untrue. 

  • Something that is false; an untrue assertion. 

truism

noun
  • A banality or cliché. 

  • A self-evident or obvious truth. 

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