molasses vs serum

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. 

serum

noun
  • The clear yellowish liquid obtained upon separating whole blood into its solid and liquid components after it has been allowed to clot. 

  • Blood serum from the tissues of immunized animals, containing antibodies and used to transfer immunity to another individual. 

  • A watery liquid from animal tissue, especially one that moistens the surface of serous membranes or that is exuded by such membranes when they become inflamed, such as in edema or a blister. 

  • The watery portion of certain animal fluids like blood, milk, etc; whey. 

  • An intensive moisturising product to be applied after cleansing but before a general moisturiser. 

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