The term "being the same class as" implies similarity and closeness. Antonyms for this phrase relate to dissimilarity and difference. These antonyms include "being in a different league," "being apart from," "being unlike," "not sharing commonality," and "having no similarity." These phrases convey the idea of distance, separation, and divergence. They can be used to describe situations where something or someone is distinct, separate, and unique. Antonyms for "being the same class as" can help express a variety of situations, including identifying differences among people, objects, or concepts.