When you're trying to describe someone or something that moves quickly, there are plenty of synonyms that can help you avoid boring repetition. Instead of simply saying "moves quickly," you might try using words like races, sprints, dashes, bolts, hurtles, or zooms. Alternatively, you could describe the way something moves by suggesting an animal or object, such as describing a person who "darts like a rabbit" or a car that "accelerates like a rocket." Whatever words you use, try to think about the specific qualities you want to convey - speed, agility, urgency, or anything else - and choose words that capture those qualities in a vivid and memorable way.