legality vs permissibility

legality

noun
  • Lawfulness. 

  • A dice game; the same as chuck-a-luck. 

permissibility

noun
  • A permissible act. 

  • The condition of being permissible; legitimacy; allowability. 

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