"On a par" is a common expression used in English to imply that things are equal or at the same level. However, there are several synonyms that can be used in place of this phrase. "Equal footing" and "equivalent" are two synonymous expressions that can be used to convey the same meaning. Other synonyms include "comparable", "equitable", "even", "identical", "parallel", and "similar." These synonyms are used to express the same idea as "on a par" but with a slightly different emphasis. Choosing the right synonym based on the context can help you communicate your message more effectively.