lawfulness vs permissibility

lawfulness

noun
  • Property of being lawful, of obeying the law. 

  • Property of operating in a manner organized by certain laws. 

permissibility

noun
  • A permissible act. 

  • The condition of being permissible; legitimacy; allowability. 

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