capsicum vs hot pepper

capsicum

noun
  • Any of several tropical American plants, of the genus Capsicum, principally the species Capsicum annuum and Capsicum frutescens, that are cultivated as edible peppers. 

  • The spicy fruit of the above plants, the bell pepper. 

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 capsicum and hot pepper occurred in a corpus of books? (source: Google Ngram Viewer )