champaign vs demesne

champaign

adj
  • Pertaining to open countryside; unforested, flat. 

demesne

noun
  • A lord's chief manor place, with that part of the lands belonging thereto which has not been granted out in tenancy; a house, and the land adjoining, kept for the proprietor's own use. 

  • A region or area; a domain. 

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