molasses vs sorghum molasses

molasses

noun
  • A thick, sweet syrup drained from sugarcane, especially (Canada, US) the still thicker and sweeter syrup produced by boiling down raw molasses. 

  • Anything considered figuratively sweet, especially sweet words. 

  • Any similarly thick and sweet syrup produced by boiling down fruit juices, tree saps, etc., especially concentrated maple syrup. 

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 molasses and sorghum molasses occurred in a corpus of books? (source: Google Ngram Viewer )