What type of fish is a swordfish?

Here's why:

* Billfish is a group of fish characterized by their long, pointed, sword-like rostrums (beaks).

* Swordfish belong to the family Xiphiidae, which is part of the order Perciformes (the same order as perch, bass, and tuna).

* The sword itself is actually an elongated upper jawbone that they use for hunting and defense.

So, while swordfish are a distinct species, they are classified within the larger category of billfish.