The phrase "on that/this score" is commonly used in English language to refer to a particular point or aspect. However, there are several synonyms that can be used as alternatives to this phrase. Some of the synonyms include "in that regard," "in this respect," "with regard to that," and "on this matter." Additionally, the phrases "on this topic" and "with respect to this issue" can also be used in place of "on that/this score." These synonyms offer variety and help to keep the language interesting while still conveying the same meaning as the original phrase.