The term "spiny-finned" is commonly used in the context of describing fishes that have spines on their fins. However, there are several ways to describe this characteristic using synonyms. For instance, the term "acanthopterygian" is a scientific term that describes fish which have spines on their fins. "Spinous-finned" is another word that can be used to describe an individual fish with fin spines. Other synonyms for "spiny-finned" include "prickly-finned," "spiky-finned," and "barbed-finned." In some instances, the term "spined" is also used to describe fish with spines on their fins. Overall, there are several synonyms for the term "spiny-finned," all of which effectively describe the characteristic of fish with spines on their fins.