molasses; black treacle
Refers to the thick, dark byproduct of sugar refining, used in cooking and industrial contexts.
Molasses is used in this bread.
sugar syrup
A broader term for any thick, sweet syrup made from sugar, not necessarily the dark refining byproduct.
Preserve fruit by soaking it in sugar syrup.
糖蜜 is the standard modern term for molasses or treacle, while 蜜 in that sense sounds old-fashioned or literary.
molasses; black treacle
Compound of 糖 (sugar) and 蜜 (honey/syrup), directly describing a sweet, thick liquid derived from sugar.