The Collaborative International Dictionary of English v.0.48:

Spearfish \Spear"fish`\, n. (Zool.)
   (a) A large and powerful fish (Tetrapturus albidus) related
       to the swordfish, but having scales and ventral fins. It
       is found on the American coast and the Mediterranean.
   (b) The carp sucker.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Quillback \Quill"back`\, n. (Zool.)
   An American fresh-water fish (Ictiobus cyprinus syn.
   Carpiodes cyprinus); -- called also carp sucker,
   sailfish, spearfish, and skimback.
   [1913 Webster]

WordNet (r) 3.0 (2006):

spearfish
    n 1: any of several large vigorous pelagic fishes resembling
         sailfishes but with first dorsal fin much reduced;
         worldwide but rare

U.S. Gazetteer Places (2000):

Spearfish, SD -- U.S. city in South Dakota
   Population (2000):    8606
   Housing Units (2000): 3904
   Land area (2000):     6.107275 sq. miles (15.817770 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    6.107275 sq. miles (15.817770 sq. km)
   FIPS code:            60020
   Located within:       South Dakota (SD), FIPS 46
   Location:             44.489803 N, 103.852585 W
   ZIP Codes (1990):     57783
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Spearfish, SD
    Spearfish