is a specific kind of: malacopterygian, soft-finned fish.

is a broader term that covers: loach | cyprinid, cyprinid fish | electric eel, Electrophorus electric | catostomid | cyprinodont | live-bearer, poeciliid, poeciliid fish, topminnow | characid, characin, characin fish.

is a member of: Cypriniformes, order Cypriniformes.