pastoress vs shepherdess

pastoress

noun
  • A female pastor (person who tends to a flock) 

  • A female pastor (minister or priest of a Christian church) 

shepherdess

noun
  • A large and deep armchair with a cushion. 

  • A female shepherd. 

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