The phrase "are part of" is a common way to describe something that belongs to or is included within a larger whole. Synonyms for this phrase include "belong to," "make up," "constitute," "comprise," "form a part of," and "are included in." These phrases convey the idea that something is not just associated with a larger entity, but is actually an integral component of it. Using synonyms can add variety and depth to your writing, making it easier to convey complex ideas in a clear and engaging way. So the next time you find yourself repeatedly using the phrase "are part of," try switching it up with one of these synonyms for a fresher, more nuanced approach.