inchoative vs prefatory

inchoative

adj
  • Inflected in or relating to the inchoative aspect. 

  • At the beginning, still in an unformed state. 

  • Aspectually indicating that a state is about to be entered or is in the process of being entered. 

noun
  • An inchoative construction. 

prefatory

adj
  • Serving as a preface or prelude; introductory, preliminary. 

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