taro vs tuber

taro

noun
  • Food from a taro plant. 

  • Any of several other species with similar corms and growth habit in Colocasia, Alocasia etc. 

  • Colocasia esculenta, raised as a food primarily for its corm, which distantly resembles potato. 

tuber

noun
  • A fleshy, thickened underground stem of a plant, usually containing stored starch, for example a potato or arrowroot. 

  • A thickened rootstock. 

  • A rounded, protuberant structure in a human or animal body. 

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