The phrase "day doom" is typically used to describe a day of reckoning or an impending disaster. Some synonyms for "day doom" include "apocalypse," "cataclysm," "Armageddon," and "judgment day." These words convey a sense of finality and a looming sense of danger or destruction. Other words that could be used to describe a similar event or feeling include "calamity," "disaster," "tragedy," and "crisis." Whether used in a religious or secular context, these words evoke a sense of urgency and warning, urging individuals to prepare for whatever may come.