Antonyms for the phrase "wast the same class as" include "belonged to a different category," "were not comparable," and "were dissimilar." When two things are not in the same class or category, they differ in their characteristics, features, and attributes. For example, a cat and a car are not in the same class or category because they have different functions, shapes, and abilities. Similarly, a banana and a book are not comparable because they serve different purposes and have unique properties. Therefore, understanding antonyms for "wast the same class as" enables us to differentiate between objects or concepts that are dissimilar, distinct, or unrelated.