large-scale vs vast

large-scale

adj
  • Large in amount, scope or extent. 

  • Drawn large so as to show detail. 

vast

adj
  • Very large or wide (literally or figuratively). 

  • Very great in size, amount, degree, intensity, or especially extent. 

noun
  • A vast space. 

How often have the words large-scale and vast occurred in a corpus of books? (source: Google Ngram Viewer )