achira vs sago

achira

noun
  • The edible rhizome of this plant. 

  • Canna indica (syn. Canna edulis), similar to arrowroot: the canna lily, the seeds of which yield a purple dye. 

sago

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

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

  • Any of the palms from which sago is extracted. 

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