illustrious vs leading

illustrious

adj
  • Admired, distinguished, respected, or well-known, especially due to past achievements or noble qualities. 

leading

adj
  • Providing guidance or direction. 

  • Occurring in advance; preceding. 

  • Ranking first. 

noun
  • Vertical space added between lines; line spacing. 

  • An act by which one is led or guided. 

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