applause vs heckling

applause

noun
  • The act of applauding; approbation and praise publicly expressed by the clapping of hands, stamping or tapping of the feet, acclamation, huzzas, or other means; marked commendation. 

heckling

noun
  • The preparation of flax for spinning using special combs called hackles. 

  • The act of one who heckles. 

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