Iron-on clothing labels are permanent and cannot be removed from clothing once applied, but it is possible to place one label on top of another once ironed on.
Adhesive clothing labels are not permanent and are intended to temporarily mark clothing, so they can be carefully peeled off. Once removed, the label will no longer stick as well as it did the first time.
Adhesive object labels are dishwasher and fridge safe but can also be removed if necessary.