gentlewoman vs niece

gentlewoman

noun
  • A female member of a legislature, especially a female member of a House of Representatives. 

  • A woman of the nobility. 

niece

noun
  • A daughter of one’s sibling, brother-in-law, or sister-in-law; either the daughter of one's brother ("fraternal niece"), or of one's sister ("sororal niece"). 

  • A daughter of one’s cousin or cousin-in-law 

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