herdswoman vs nanny

herdswoman

noun
  • A woman who tends livestock, especially cows and sheep. 

nanny

noun
  • A female goat. 

  • A child's nurse. 

  • A godmother. 

  • A grandmother. 

verb
  • To treat like a nanny's charges; to coddle. 

  • To serve as a nanny. 

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