grandee vs viscount

grandee

noun
  • A high-ranking nobleman in Spain or Portugal. 

  • A person of high rank. 

viscount

noun
  • A member of the peerage, above a baron but below a count or earl. 

  • Any of various nymphalid butterflies of the genus Tanaecia. Other butterflies in this genus are called earls and counts. 

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