The Collaborative International Dictionary of English v.0.48:

Saury \Sau"ry\, n.; pl. Sauries. [Etymol. uncertain.] (Zool.)
   A slender marine fish (Scomberesox saurus) of Europe and
   America. It has long, thin, beaklike jaws. Called also
   billfish, gowdnook, gawnook, skipper, skipjack,
   skopster, lizard fish, and Egypt herring.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Billfish \Bill"fish`\ (b[i^]l"f[i^]sh`), n. (Zool.)
   A name applied to several distinct fishes:
   (a) The garfish (Tylosurus longirostris, or Belone
       longirostris) and allied species.
   (b) The saury, a slender fish of the Atlantic coast
       (Scomberesox saurus).
   (c) The Tetrapturus albidus, a large oceanic species
       related to the swordfish; the spearfish.
   (d) The American fresh-water garpike (Lepidosteus osseus).
       [1913 Webster]

WordNet (r) 3.0 (2006):

billfish
    n 1: primitive predaceous North American fish covered with hard
         scales and having long jaws with needlelike teeth [syn:
         gar, garfish, garpike, billfish, Lepisosteus
         osseus]
    2: giant warm-water game fish having a prolonged and rounded
       toothless upper jaw
    3: slender long-beaked fish of temperate Atlantic waters [syn:
       saury, billfish, Scomberesox saurus]
    4: elongate European surface-dwelling predacious fishes with
       long toothed jaws; abundant in coastal waters [syn:
       needlefish, gar, billfish]