The word "unballast" refers to the action of removing the weight that is used to stabilize a ship. However, there are many other words that can be used to describe this action. Some synonyms for "unballast" include "unload," "lighten," "disburden," and "unburden." These words can also be used in different contexts to describe the act of removing weight from various other entities such as airplanes or vehicles. Additionally, some other similar words to "unballast" include "jettison," "discard," and "dump." All of these words have the common theme of removing or getting rid of something that is no longer needed or is weighing down an object.