comeback vs upturn

comeback

noun
  • A return (e.g. to popularity, success, etc.) after an extended period of obscurity. 

  • A retort or answer, particularly a quick or clever one. 

  • An occurrence of an athlete or sports team in a competition overcoming a substantial disadvantage in points to win or draw. 

upturn

noun
  • an upward turn or trend, especially in business activity or profit 

verb
  • to turn (something) up or over 

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