There are several synonyms for the phrase "worlds in collision," including conflicts of different worlds, clashing cultures, clashes of civilizations, divergent perspectives, and colliding viewpoints. These synonyms denote a sense of tension and instability where differing beliefs, values, cultures, and ideologies come into contact with one another, leading to misunderstandings, clashes, and a sense of discord. The phrase "worlds in collision" implies a sense of upheaval or disruption where opposing forces come into contact and cause upheaval and chaos. In contrast, terms like "clashing cultures" or "divergent perspectives" suggest more subtle differences and tensions between groups rather than explosive conflicts.