The term heteromorphic means "diverse in form or shape," so antonyms for more heteromorphic would be terms such as uniform, identical, or similar. These antonyms indicate a lack of difference or variance in shape or form. For instance, if a set of objects were all the same size and shape, they would be considered uniform, whereas if they all looked different, they would be heteromorphic. In the animal kingdom, a species that looks nearly identical across its population has a homomorphic appearance, while one with significant differences is heteromorphic. Therefore, using antonyms of heteromorphic can help describe objects or organisms that have fewer noticeable differences.