The term 'American Fish' encompasses four different species of fish: Piranha (7 letters), Cisco (5 letters), Pickerel (8 letters) and Tetra (5 letters). Piranhas are a species of freshwater fish native to South America, known for their sharp teeth and aggressive behavior. Ciscos are a species of coldwater fish found in the Great Lakes region of North America. Pickerels are a species of freshwater fish found in North America, related to the walleye. Tetras are a group of small, brightly colored tropical fish native to Central and South America.