authorship vs fathership

authorship

noun
  • The source; origin; origination 

  • The quality or state of being an author; the function or dignity of an author. 

fathership

noun
  • The state of being a father; fatherhood; paternity. 

  • A title of respect addressed to a priest. 

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