How is a Jellyfish fish different from a Portuguese Man o War?

A jellyfish is a Scyphozoan cnidarian, and is composted of a single animal, while a Portuguese Man'o'war is a Hydrozoan cnidarian, and is a colonial animal composed of several individual polyps, with one polyp enlarged to serve as the colony's float, and the other polyps serving to defend and feed the colony with their long tentacles.