The phrase "being composed of" is commonly used to describe the makeup or construction of something. However, there are several synonyms that can be used to convey a similar meaning such as "made up of," "constructed from," "comprised of," "consisting of," and "formed of." These synonyms can be used interchangeably to provide variety and clarity in writing. They all suggest that something is made up of different parts or elements that come together to create a whole. So, whether you're writing a scientific report or a creative piece, using synonyms for "being composed of" can add depth and nuance to your language.