The Collaborative International Dictionary of English v.0.48:

Hercules \Her"cu*les\, n.
   1. (Gr. Myth.) A hero, fabled to have been the son of Jupiter
      and Alcmena, and celebrated for great strength, esp. for
      the accomplishment of his twelve great tasks or "labors."
      [1913 Webster]

   2. (Astron.) A constellation in the northern hemisphere, near
      Lyra.
      [1913 Webster]

   Hercules' beetle (Zool.), any species of Dynastes, an
      American genus of very large lamellicorn beetles, esp.
      Dynastes hercules of South America, which grows to a
      length of six inches.

   Hercules powder, an explosive containing nitroglycerin; --
      used for blasting.
      [1913 Webster] Hercules'-club
      Hercules'-club

WordNet (r) 3.0 (2006):

Hercules
    n 1: (classical mythology) a hero noted for his strength;
         performed 12 immense labors to gain immortality [syn:
         Hercules, Heracles, Herakles, Alcides]
    2: a large constellation in the northern hemisphere between Lyra
       and Corona Borealis

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "Hercules":
   Antaeus, Atlas, Briareus, Brobdingnagian, Charles Atlas, Cyclops,
   Gargantua, Goliath, Orion, Polyphemus, Samson, Superman, Tarzan,
   Telamon, Titan, bully, bullyboy, colossus, giant, gorilla,
   muscle man, powerhouse, stalwart, strong man, strong-arm man,
   the mighty, the strong, tough, tough guy, tower of strength



U.S. Gazetteer Places (2000):

Hercules, CA -- U.S. city in California
   Population (2000):    19488
   Housing Units (2000): 6546
   Land area (2000):     6.478230 sq. miles (16.778537 sq. km)
   Water area (2000):    11.820971 sq. miles (30.616173 sq. km)
   Total area (2000):    18.299201 sq. miles (47.394710 sq. km)
   FIPS code:            33308
   Located within:       California (CA), FIPS 06
   Location:             38.007489 N, 122.258742 W
   ZIP Codes (1990):     94547
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Hercules, CA
    Hercules