"Sharpened a distinction" is a common phrase used to indicate making a clear distinction or differentiation between two things. However, there are several synonyms that can be used to convey the same meaning of making a sharp or clear distinction. Some of these words include "clarified," "defined," "differentiated," "accentuated," and "highlighted." Each of these words can be used in a variety of contexts to indicate a focused or precise distinction, depending on the tone and style of writing. Ultimately, choosing the right synonym will depend on the writer's specific intent and the overall tone of the text.