Creaminess makes a poor witness. Although ice cream gets much of its richness from dairy fat and milk solids, sorbet can deliver a similarly smooth sensation through fruit, dissolved sugar and ice crystals small enough to escape notice on the tongue. The resemblance proves little. Beneath that polished surface, two desserts can owe their texture to quite different ingredients and physical structures.
Sugar deserves more credit. In sorbet, freezing point depression means that dissolved sugars lower the temperature at which water freezes, leaving some water unfrozen at serving temperatures and helping prevent a solid, unyielding block. Crystal size matters too. Freezing and churning help produce small crystals, while fruit pulp and pectin can add body to the mixture, making a spoonful feel substantial without cream. Storage can undo that work. When temperatures fluctuate, recrystallization can enlarge ice crystals, turning a previously smooth dessert noticeably coarse.
The label outranks the spoon. Ice cream generally combines an emulsion of dairy fat and water with milk proteins, air and ice crystals, whereas sorbet typically starts with fruit, water and sugar, sometimes assisted by stabilizers. Neither name guarantees simplicity. A sorbet recipe may contain unexpected ingredients, and shared equipment can introduce milk through cross-contact, so anyone avoiding dairy should check ingredient and allergen information rather than trust mouthfeel alone. Smoothness offers no certificate. On the spoon, the distinction can disappear; on the ingredient list, it remains.
