One word substitute is Chip.Splinter: a small, thin, sharp piece of wood, glass, or similar material broken off from a larger piece.Crumb: a small fragment of bread, cake, or biscuit.Scrap: a small piece or amount of something, especially one that is left over after the greater part has been used.Chip: a small piece of something removed in the course of chopping, cutting, or breaking a hard material such as wood or stone.