make a killing vs rack up

make a killing

verb
  • To win or earn a large amount of money. 

rack up

verb
  • to gain (points etc.; in a game or sport), to accumulate 

  • to arrange in a rack 

  • to acquire, to gather together. 

  • to defeat severely, to thrash 

How often have the words make a killing and rack up occurred in a corpus of books? (source: Google Ngram Viewer )