maternity vs mummyhood

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. 

mummyhood

noun

  • Motherhood. 

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