Dredgers are vessels used for underwater excavation, and there are a variety of synonyms that can be used to describe them. These include dredging vessels, dredging machines, draggers, excavators, and suction dredges. Dredging vessels can refer to both stationary and mobile vessels that are used to excavate underwater deposits, while dredging machines specifically refers to the equipment used to do the excavation. Draggers are typically smaller dredging vessels that are towed to their destination, while excavators are large-scale machines that are used to dig up and remove underwater materials. Suction dredges work by using a vacuum system to suck up materials from the ocean floor. Ultimately, there are many different words that can be used to describe the versatile and important vessels used for underwater excavation.