eternally vs for keeps

eternally

adv
  • Unceasingly, recurringly. 

  • For eternity; forever. 

for keeps

prep
  • With an agreement or intention to retain what one gains or receives. 

  • Permanently, so that one can keep something indefinitely. 

  • With a strong competitive resolve to win or succeed, as in sports or business. 

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