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He would stay in Ferney for most of the remaining 20 years of his life , frequently entertaining distinguished guests , such as James Boswell , Adam Smith , Giacomo Casanova , and Edward Gibbon .
 Ferney, James Boswell, Adam Smith, Giacomo Casanova, Edward Gibbon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ferney, James Boswell, Adam Smith, Giacomo Casanova, Edward Gibbon