The phrase "are an element of" implies inclusion or membership, and there are several synonymous phrases that can be used in its place. For example, "belong to," "form a part of," and "are a component of" all convey similar meanings. Other alternatives include "are comprised in," "constitute a portion of," and "are a constituent of." In each of these phrases, the key concept is the idea of something being a necessary and integral part of a larger whole. By using synonyms for "are an element of," writers can add variety and nuance to their language, while still conveying the same essential meaning.