cassava vs manioc

cassava

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

  • Tapioca, a starchy pulp made with manioc roots. 

manioc

noun
  • The tropical plant Manihot esculenta, from which cassava and tapioca are prepared. 

  • Cassava root, eaten as a food. 

  • A food starch prepared from the root. 

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