durra vs kaoliang

durra

noun
  • A kind of millet, a variety of sorghum; Indian millet (Sorghum bicolor). 

kaoliang

noun
  • Any of various Chinese varieties of sorghum. 

  • A sorghum-based variety of baijiu. 

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