black pepper vs hot 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. 

hot pepper

noun
  • Any of the plants that bear such fruit, especially the species Capsicum annuum and Capsicum frutescens and their numerous subspecies, varieties, or cultivars. 

  • Any of various small peppers of highly notable pungency or heat. 

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