pedagogy vs preparation

pedagogy

noun
  • The activities of educating, teaching or instructing. 

  • The strategies or methods of instruction; an educational philosophy. 

  • The profession of teaching. 

preparation

noun
  • The act of preparing or getting ready. 

  • The day before the Sabbath or other Jewish feast-day. 

  • A substance, especially a remedy, that is prepared. 

  • The state of being prepared; readiness. 

  • Devotional exercises introducing an office. 

  • Any of the objects placed between the strings of a prepared piano. 

  • The previous introduction, as an integral part of a chord, of a note continued into a succeeding dissonance. 

  • A part of any animal body preserved as a specimen. 

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