A compactor is a machine that compresses waste materials or loose soil to make it more condensed and easy to transport. Some synonyms include press, compressor, crusher, baler, hauler, and packer. Each of these words relates to the same function of reducing materials to a smaller, more manageable size. Press refers to the exertion of force upon something by means of a machine. A compressor compresses air or gas to create a condensed material. A crusher breaks down materials by applying pressure or impact. A baler compresses and binds material like cardboard or hay. A hauler transports and disposes of material, and a packer provides goods packaging.