peeress vs sultana

peeress

noun
  • A woman holding a noble title in her own right. 

  • A noblewoman married to a peer. 

sultana

noun
  • A female ruler of a sultanate. 

  • An old form of necklace. 

  • A pale yellow raisin made from a seedless grape. 

  • A type of viol, a cither viol. 

  • A wife or mistress of a sultan. 

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