Gigabuck is a slang word used to describe a large sum of money. Synonyms of gigabuck include megabucks, fortune, a small fortune, and a king's ransom. These synonyms describe a significant amount of wealth that is often associated with the affluent and wealthy. Other synonyms for gigabuck include a mountain of money, a substantial sum, and a huge amount. These words provide a vivid description of the vast amount of wealth being discussed, giving the listener or reader a clear picture of the situation. Using synonyms for gigabuck can add depth to any conversation or written piece and help evoke an image in the minds of those reading or listening.