inaugural vs proving

inaugural

adj
  • Of inauguration; as in a speech or lecture by the person being inaugurated. 

  • Marking the beginning of an operation, venture, etc. 

noun
  • An inauguration; a formal beginning. 

  • A formal speech given at the beginning of an office. 

proving

noun
  • Experimentation to determine which substances cause which effects when ingested. 

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