Alchemise is a verb that refers to the act of transforming a substance into something of greater value or importance. There are several synonyms that can be used in place of alchemise, including transmute, metamorphose, convert, transform, and transfigure. Transmute specifically refers to the process of changing one element into another, whereas metamorphose suggests a more dramatic, complete change. Convert implies a change in form or function, while transform and transfigure both suggest a change in appearance or nature. All of these words convey the idea of change and transformation, but each has a slightly different connotation that may be more appropriate depending on the context of the sentence.