Melt is a common word used to describe the process in which a solid substance turns into a liquid under certain conditions. However, there are other words that can be used to express this same idea. One such synonym is "liquefy", which refers to the transformation of a substance from a solid to a liquid state. Another word that can be used in place of melt is "thaw", which means to become liquid as a result of the rise in temperature. "Fuse" is another term synonymous with melt, and it is frequently used to describe the process of combining two or more substances through the application of heat.