Points of resemblance in taste may involve sweetness, bitterness, saltiness, and sourness. Smell may involve pleasantness, sharpness, mildness, or offensiveness of scent. Both are sensory even though neither is visual.
“Honey and sugar in sweetness.”
“A rose and musk in pleasant fragrance.”
Literal sweetness of taste and metaphorical “sweetness” of speech should not be treated as identical without analysis. Applying a sensory term to an intellectual or emotional quality may require an imagined correspondence rather than straightforward literal sharing.