meditation vs musing

meditation

noun
  • A devotional exercise of, or leading to contemplation. 

  • A contemplative discourse, often on a religious or philosophical subject. 

  • Careful and thorough thought. 

  • A musical theme treated in a meditative manner. 

musing

noun
  • thought, meditation, contemplation 

adj
  • Absorbed in thought; contemplative 

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