Superorder Malacopterygii is a term used to describe a group of fish that have soft, fleshy fins. There are a few different synonyms for this term that you may come across in scientific literature or other contexts. One such synonym is the term "soft-rayed fishes," which refers to the same group of fish that have these unique fins. Another term that you might see used to describe this group is "malacopterygian fishes," which is a more formal and technical term but means the same thing. Ultimately, no matter which of these terms you use, they all refer to the same fascinating group of fish with unique physical characteristics.