When it comes to violent and futuristic action movies, the term "hand grenade blockbuster" is a common phrase used to describe a certain genre. However, there are several other terms or synonyms that can be used to express the same type of movie. For instance, "high-octane thrill ride" is a phrase that denotes action-packed and adrenaline-fueled films. "Explosive action flick" also works well in describing movies with intense fight scenes and fiery explosions. Additionally, the phrase "chaos cinema" is used to characterize movies with fast-paced editing and overwhelming action sequences. Overall, these synonyms help to capture the essence of the "hand grenade blockbuster" and depict the genre as an exciting and thrilling experience.