Celebrater is a word commonly used to describe a person who takes part in festivities, rejoices or engages in merrymaking. But there are numerous synonyms for this word, each with a slightly different nuance. One possible synonym could be a reveler, which suggests a person who enjoys parties or social events. Another synonym could be a jubilator, which often connotes celebrating a significant event or achievement. A third synonym could be a commemorer, which focuses on celebrating a momentous occasion or honoring a person or event. Overall, these synonyms provide different shades of meaning that can help to enrich one's vocabulary and communication skills.