cassava vs tapioca

cassava

noun
  • Manioc (Manihot esculenta), a tropical plant which is the source of tapioca. 

  • Tapioca, a starchy pulp made with manioc roots. 

tapioca

noun
  • The cassava plant, Manihot esculenta, from which tapioca is derived; manioc. 

  • A starchy food made from the cassava plant, used in puddings. 

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