beetroot vs mangelwurzel

beetroot

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

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

verb
  • To turn a bright red or purple colour. 

mangelwurzel

noun
  • A root vegetable, variety of Beta vulgaris, cultivated chiefly as cattle feed. 

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