beetroot vs chard

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. 

chard

noun
  • An edible leafy vegetable, Beta vulgaris subsp. cicla, with a slightly bitter taste. 

  • Artichoke leaves and shoots, blanched to eat. 

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