Unicron is a fictional character in the Transformers franchise, and as such, there are not many synonyms for the word "Unicron." However, some synonyms that could be used to describe this legendary character include the one who brings destruction, devourer of worlds, and cosmic terror. Additionally, some fans of the franchise might use alternative names for the character, such as Planet Eater or Dark God. Regardless of the terminology used, Unicron is known for his immense power and the ability to cause destruction on an unimaginable scale, earning him a place as one of the most iconic villains in science fiction.