linger vs procrastinate

linger

verb
  • To stay or remain in a place or situation, especially as if unwilling to depart or not easily able to do so. 

  • To remain alive or existent although still proceeding toward death or extinction; to die gradually. 

  • To consider or contemplate for a period of time; to engage in analytic thinking or discussion. 

procrastinate

verb
  • To put off; to delay (something). 

  • To delay taking action; to wait until later. 

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