sago vs tapioca

sago

noun
  • A powdered starch obtained from certain palms and used as a food thickener. 

  • A similar starch obtained from a palm-like cycad (Cycas revoluta) 

  • Any of the palms from which sago is extracted. 

tapioca

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

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

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