The phrase "are a par with" is often used to describe things that are equal or of similar quality, status, or achievement. Antonyms to this phrase would be words that suggest a difference in these aspects. Opposing words to "are a par with" could range from antithetical terms such as inferior, worse, or below par to words that indicate a higher level, such as superior, surpassing, or outstanding. It all depends on the context of the sentence and what the author or speaker is trying to convey. However, in general, the antonyms of "are a par with" would suggest a discrepancy in the comparative levels of two entities.