decree vs illegality

decree

verb
  • To command by a decree. 

noun
  • The determination of a cause in a court of admiralty or court of probate. 

  • An edict or law. 

  • A predetermination made by God; an act of providence. 

  • The judicial decision in a litigated cause rendered by a court of equity. 

illegality

noun
  • a defense to the validity of a contract because it was in violation of the law 

  • the state of being illegal 

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