Blackstrap is a word often used to describe a type of molasses that is much darker, thicker, and more bitter than traditional molasses. However, if you are looking for synonyms for the word blackstrap, there are several options. Some common alternatives include dark molasses, black treacle, and robust molasses. Other related words might include unsulphured molasses, which is a less processed form of molasses, or cane syrup, which is made from the same sugar cane plant as molasses. Whatever term you choose, you can be sure that the deep, rich flavor of blackstrap will add a complexity and depth to any recipe.