champaign vs purview

champaign

adj
  • Pertaining to open countryside; unforested, flat. 

purview

noun
  • Range of understanding. 

  • The scope of a statute. 

  • The enacting part of a statute. 

  • Scope or range of interest or control. 

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