Consider definitions from the Merriam-Webster dictionary:
: having a thin edge that is able to cut things
: having a fine edge or point
These two adjectives will serve to describe
A) The thinness of the edge (sharpness) as quantified by the edge width at 3 microns from the apex.
B) The edge width or fineness of the edge (keenness) as measured at the very apex of the bevel.
These two words are colloquially synonyms; however, we require more precise definitions reflecting the subtle differences in the meanings of the two words.