customary vs familiar

customary

adj
  • In accordance with, or established by, custom or common usage 

  • Holding or held by custom 

noun
  • A book containing laws and usages, or customs; a custumal. 

familiar

adj
  • Known to one, or generally known; commonplace. 

  • Of or pertaining to a family; familial. 

  • Intimate or friendly. 

  • 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. 

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