The antonyms for the word "unloads" are "loads," "fills," and "packs." These words all suggest the opposite action of unloading, which typically involves putting goods, materials, or objects onto a surface or into a container. When these actions occur, they result in a fuller, heavier or more compacted space. "Loads" typically refers to the act of putting a heavy object onto a vehicle, such as a truck, while "fills" suggests the completion of a space or container with something, while "packs" refers to the action of putting items together into a small space or suitcase.