capsicum vs horseradish

capsicum

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

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

horseradish

noun
  • A pungent condiment made from the root of the plant. 

  • A plant of the mustard family, Armoracia rusticana. 

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