contemplation vs vacancy

contemplation

noun
  • The act of contemplating; musing; being highly concentrated in thought 

  • The act of looking forward to a future event 

  • Holy meditation. 

  • The state of being considered or planned. 

vacancy

noun
  • A blank mind, unoccupied with thought. 

  • Empty space. 

  • An available room in a hotel; guest house, etc. 

  • An unoccupied position or job. 

  • Lack of intelligence or understanding. 

  • A defect in a crystal caused by the absence of an atom in a lattice 

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