contemplation vs musing

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. 

musing

noun
  • thought, meditation, contemplation 

adj
  • Absorbed in thought; contemplative 

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