black pepper vs red pepper

black pepper

noun
  • The dried, unripe berries (peppercorns) of the Piper nigrum plant which are commonly used as a spice and seasoning. They are either used whole, or in a ground or crushed form. 

  • The plant Piper nigrum. 

red pepper

noun
  • A red-colored, ripe, bell or sweet pepper. Unripe peppers of this variety are green and edible but not as sweet. 

  • Spicy pepper. 

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