The term 'opah' is a type of MOONFISH, which is an 8-letter word. It is a large, colorful, deep-bodied fish found in tropical and temperate waters around the world. It is a popular game fish due to its size and strength, and is also highly sought after for its delicious flesh. Opah are also known as sunfish, kingfish, or MOONFISH, and can grow up to 2 meters in length. They have a unique, circular shape and are covered in bright, iridescent scales.