Isospondyli refers to a group of bony fish that have similar vertebrae with centra that are roughly equal in size. Some possible synonyms for this word include same-bodied fish or same-vertebrae fish. These terms both focus on the similar physical characteristics of the fish in this group. Another possible synonym is equal-spined fish, which again emphasizes the similar features of their vertebrae. Lastly, one could use the term uniform-boned fish to refer to this group, as their vertebrae are of uniform size and shape. Overall, these synonyms provide a clearer understanding of the characteristics that define the Isospondyli group of fish.