linger vs unstick

linger

verb
  • 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. 

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

unstick

verb
  • To free from the condition of being stuck. 

  • To leave the ground during takeoff. 

  • To become freed from a stuck condition. 

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