horseradish vs sweet pepper

horseradish

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

  • A plant of the mustard family, Armoracia rusticana. 

sweet pepper

noun
  • The fruit of a non-spicy cultivar of pepper, Capsicum annuum, marketed in green-, red-, yellow- and orange-skinned varieties. 

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