fatherness vs maternity

fatherness

noun
  • The state or quality of being a father. 

maternity

noun
  • The state of being a mother; motherhood. 

  • The state of being pregnant; pregnancy. 

  • A ward or department in a hospital in which babies are born. 

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