The term "made up of" is a commonly used phrase to describe the composition of something. However, there are several synonyms that can be used to convey the same meaning. Phrases such as "composed of," "consists of," "formed from," "constituted by," and "comprised of" are fine alternatives that can be used interchangeably with "made up of." Depending on the context, other synonymous expressions like "constructed of," "built from," "shaped by," and "assembled from" can also be used. By using a variety of words to describe the composition of an object, one can avoid repetition and add interest to their writing.