excellent vs rewarding

excellent

adj
  • Superior in kind or degree, irrespective of moral quality. 

  • Having excelled, having surpassed. 

  • Exceptionally good of its kind. 

  • Of higher or the highest quality; splendid. 

rewarding

adj
  • Giving or resulting in reward or satisfaction. 

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