earn vs feather one's nest

earn

verb
  • To gain (success, reward, recognition) through applied effort or work. 

  • To cause (someone) to receive payment or reward. 

  • To achieve by being worthy of. 

  • To receive payment for work. 

feather one's nest

verb
  • To achieve benefits, especially financial ones, by taking advantage of the opportunities with which one is presented; to amass a comfortable amount of personal wealth. 

How often have the words earn and feather one's nest occurred in a corpus of books? (source: Google Ngram Viewer )