dedicatory vs inscription

dedicatory

noun
  • A dedication. 

adj
  • Of or pertaining to dedication. 

inscription

noun
  • Words written in the front of a book as a dedication. 

  • Text carved on a wall or plaque, such as a memorial or gravestone. 

  • The text on a coin. 

  • The act of inscribing. 

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