horseradish vs rutabaga

horseradish

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

  • A plant of the mustard family, Armoracia rusticana. 

rutabaga

noun
  • The edible root of this plant 

  • The swede, or Swedish turnip; the European plant Brassica napus var. napobrassica 

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