bell pepper vs cayenne pepper

bell pepper

noun
  • Capsicum annuum, an edible spicy-sweet fruit, originating in the New World. 

cayenne pepper

noun
  • A powder condiment or spice formed from the dried chilli pepper varieties above. 

  • Any of several very hot chilli peppers. 

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