beet vs beetroot

beet

noun
  • A beetroot, a swollen root of such a plant. 

  • Beta vulgaris, a plant with a swollen root which is eaten or used to make sugar. 

beetroot

noun
  • The edible part of the root of a beet plant, raw or prepared. 

  • A normally deep-red-coloured root vegetable usually cooked or pickled before eating; Synonym of beet. 

verb
  • To turn a bright red or purple colour. 

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