expanse vs purlieu

expanse

noun
  • A wide stretch, usually of sea, sky, or land. 

  • An amount of spread or stretch. 

purlieu

noun
  • The ground on the edges of a forest, especially when partly subject to the same forest laws concerning game hunting etc. 

  • The outskirts of any place; an adjacent district; the environs or neighborhood. 

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