familiar vs nonformal

familiar

adj
  • Intimate or friendly. 

  • Of or pertaining to a family; familial. 

  • Known to one, or generally known; commonplace. 

  • Acquainted. 

noun
  • An attendant spirit, often in animal or demon form. 

  • The officer of the Inquisition who arrested suspected people. 

  • A member of a pope's or bishop's household. 

nonformal

adj
  • Not formal. 

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