countryside vs exurban

countryside

noun
  • An area located outside of towns and cities; an area that is not urban or suburban; a rural area. 

  • Such part of a larger area. 

  • A rural landscape. 

exurban

adj
  • Of, pertaining to, or residing in an exurb 

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