the.com/billfish

means A broad name for marine fish — marlin, swordfish, sailfish, spearfish — whose upper jaw is drawn out into a long, bony bill or spear.

from Straightforward compound English: 'bill' (a beak-like projection, the same word used for a bird's beak) plus 'fish.' The term emerged as a practical catch-all among anglers and naturalists needing one word for these jaw-spiked hunters, grouping species that aren't all close relatives but share that signature pointed weapon.