earnings vs flash in the pan

earnings

noun
  • Wages, money earned, income. 

  • Business profits. 

  • Gains on investments; returns. 

flash in the pan

noun
  • A career notable for early success not followed by significant accomplishment. 

  • A transient occurrence with no long-term effect. 

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