Berserker is a term commonly used to describe someone who exhibits a wild and violent temperament. However, there are many synonyms that can be used to convey this same idea. Some examples include rampageous, ferocious, savage, uncontrollable, and frenzied. These words all describe a similar state of mind where an individual is operating at a heightened level of aggression and may act in an unpredictable manner. Other synonyms could include violent, crazy, mad, and rabid. When selecting a synonym for berserker, it's important to consider the context in which it is being used so that the appropriate word can be chosen.