Piranhas are one of the most dangerous freshwater fish, known for their razor-sharp teeth and aggressive behavior. However, there are many synonyms for this infamous fish, including caribe, piraya, piraiba, and red-bellied piranha. Some other lesser-known synonyms for piranha include the sachara, tambaqui, and tucunare. In addition, there are several fictional species of piranhas, such as the mutant piranhas from the horror film "Piranha 3D." Regardless of the name, one thing is for sure: these fish are not to be underestimated. Whether you call them piranhas or by another name, they are the stuff of nightmares for swimmers and fishermen alike.