pimento vs red pepper

pimento

noun
  • A red sweet pepper, a cultivar of Capsicum annuum, used to make relish, stuffed into olives, or used as spice. 

  • A tropical berry used to make allspice. 

  • The tree on which it grows. 

red pepper

noun
  • Spicy pepper. 

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

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