leading vs ruling

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. 

ruling

noun
  • An order or a decision on a point of law from someone in authority. 

adj
  • That rules; predominant; chief; reigning; controlling. 

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