promo vs whispering

promo

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

verb
  • To promote; to publicize. 

whispering

noun
  • Something that is whispered; gossip; a rumor. 

adj
  • that whispers 

  • associated with whispers 

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