extensive vs sparse

extensive

adj
  • Having a great extent; covering a large area; vast. 

  • Serving to extend or lengthen; characterized by extension. 

  • Having a combined system entropy that equals the sum of the entropies of the independent systems. 

  • Considerable in amount. 

sparse

adj
  • Having widely spaced intervals. 

  • Having few nonzero elements 

  • Not dense; meager; scanty 

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