Egomaniacal is a term used to describe someone who is obsessed with their own importance or power. There are several synonyms that can be used to describe such people including narcissistic, self-absorbed, self-centered, egocentric, and self-obsessed. Other related synonyms include arrogant, haughty, conceited, pompous, and overbearing. These words all describe individuals who place themselves above others and believe they are superior in some way. They may exhibit a lack of empathy or concern for others and may have a need for constant attention and admiration. Using these synonyms can give a more nuanced description of an individual's behavior and can aid in understanding their motives and actions.