There are several kinds of sugar, which are Sugar cane, Sugar palm, Coconut palm, Sugar maple and Sugar beet. All of them have a same complex chemical structure called Polysaccharide which also stored energy to be used by the activities of human body's cell. And that biological technical term is the provenance of reasons why the name of sugar almost end with the word "-o" (-ose), such as Glucose, Sucrose and Lactose etc