nil vs nullity

nil

noun

  • Nothing; zero. 

  • A score of zero 

det

  • No, not any. 

nullity

noun

  • The state of being null, or void, or invalid. 

  • The difference between the rank of a matrix and the number of columns it has; the dimension of the nullspace of a matrix. 

  • A void act; a defective proceeding or one expressly declared by statute to be a nullity. 

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