absurdity vs self-contradiction

absurdity

noun
  • That which is absurd; an absurd action; a logical contradiction. 

  • The quality of being absurd or inconsistent with obvious truth, reason, or sound judgment. 

self-contradiction

noun
  • A statement that contains a contradiction, or a premise from which one could be derived 

How often have the words absurdity and self-contradiction occurred in a corpus of books? (source: Google Ngram Viewer )