sorghum vs sorghum molasses

sorghum

noun
  • Sorghum syrup. 

  • A cereal, Sorghum genus and species, the grains of which are cultivated to make flour and feed cattle. Almost all cultivated ones as well as some wild ones belong to the species Sorghum bicolor (syn. Sorghum vulgare). 

sorghum molasses

noun
  • A syrup made from varieties of sorghum grass with a high sugar content, particularly in the Southern United States. 

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