Live one is a phrase that can be used to refer to someone who is energetic, lively, or full of energy. There are many synonyms that can be used to describe a live one, depending on the context. Some common synonyms include lively, vivacious, spirited, animated, exuberant, and enthusiastic. Other synonyms that can be used to describe a live one include peppy, high-spirited, zesty, zestful, dynamic, and effervescent. Whether you are describing someone's personality, energy level, or behavior, there are plenty of synonyms that can be used to capture the essence of a live one.