promo vs spiel

promo

verb
  • To promote; to publicize. 

noun
  • an interview or monologue intended to promote a character or an upcoming match. 

spiel

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

  • To talk at length. 

noun
  • A game of curling. 

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

  • An early form of rap music. 

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