The term "Doomsday Machine" is often associated with apocalyptic scenarios and destructive devices that can cause widespread devastation. However, there are a few alternative terms that can be used to describe similar types of machines. One such term is "Armageddon device," which derives from the biblical prophecy of a final battle between good and evil. Another synonym is "extermination machine," which implies the intent to eradicate all life. "Annihilation device" is another option that emphasizes the destructive power of the machine. In any case, these synonyms all convey a sense of impending disaster and are often associated with science fiction and other speculative genres.