immobility vs loiter

immobility

noun
  • The quality of not moving. 

  • The state or condition of being unable to change one's location, move or be moved. 

loiter

noun
  • A standing or strolling about without any aim or purpose. 

verb
  • To remain at a certain place instead of moving on. 

  • To stand about without any aim or purpose; to stand about idly. 

  • For an aircraft to remain in the air near a target. 

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