There are many synonyms for the word "supporter of devil," including demoniac, Satanist, devil worshipper, fiend, devil's advocate, hellion, and fiendish. These terms are used to describe individuals who openly and actively support the works of the devil, whether out of genuine belief or as a form of rebellion against traditional morality. Some of these terms, such as devil worshipper, are used to describe individuals who follow specific religions or belief systems, while others, like hellion or fiendish, are more general and may be used to describe anyone who is perceived as being particularly wicked or immoral.