persuading vs spiel

persuading

noun
  • An act of persuasion. 

spiel

noun
  • A lengthy and extravagant speech or argument usually intended to persuade. 

  • A game of curling. 

  • An early form of rap music. 

verb
  • To give a sales pitch; to promote by speaking. 

  • To talk at length. 

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