molasses vs sirop

molasses

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

  • 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. 

sirop

noun
  • A kettle used in making sugar by the open-kettle process. 

  • A concentrated fruit drink; a cordial. 

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