leading vs second-rate

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. 

second-rate

noun
  • A second-rate ship of the line. 

adj
  • Of a Royal Navy ship of the line in the Napoleonic Era: having 80–98 guns across three gun decks, a complement of 700–750, and weighing approximately 2,200 tons burthen. 

  • Of mediocre quality; not first-rate. 

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