donna vs milady

donna

noun
  • A lady, especially a noblewoman; the title given to a lady in Italy. 

milady

noun
  • An English noblewoman or gentlewoman; the form of address to such a person; a lady. 

verb
  • To address as “milady”. 

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