second-rate vs unrivaled

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. 

unrivaled

adj
  • beyond compare, far surpassing any other, unparalleled, without rival. 

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