red-letter vs something else

red-letter

adj
  • Particularly significant or positive. 

something else

noun
  • Another unspecified item, perhaps not yet known or decided upon. 

  • Something exceptional, out of the ordinary, unusual. 

  • A person or thing that is outstandingly bad. 

How often have the words red-letter and something else occurred in a corpus of books? (source: Google Ngram Viewer )