influential vs leading

influential

noun
  • A person who has influence 

adj
  • Having or exerting influence. 

leading

noun
  • An act by which one is led or guided. 

  • Vertical space added between lines; line spacing. 

adj
  • Providing guidance or direction. 

  • Occurring in advance; preceding. 

  • Ranking first. 

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