WordNet (r) 3.0 (2006):

Hephaestus
    n 1: (Greek mythology) the lame god of fire and metalworking in
         ancient mythology; identified with Roman Vulcan [syn:
         Hephaestus, Hephaistos]

Moby Thesaurus II by Grady Ward, 1.0:

75 Moby Thesaurus words for "Hephaestus":
   Agdistis, Amor, Aphrodite, Apollo, Apollon, Ares, Artemis, Ate,
   Athena, Bacchus, Ceres, Cora, Cronus, Cupid, Cybele, Demeter,
   Despoina, Diana, Dionysus, Dis, Eros, Gaea, Gaia, Ge, Great Mother,
   Hades, Helios, Hera, Here, Hermes, Hestia, Hymen, Hyperion, Jove,
   Juno, Jupiter, Jupiter Fidius, Jupiter Fulgur,
   Jupiter Optimus Maximus, Jupiter Pluvius, Jupiter Tonans, Kore,
   Kronos, Magna Mater, Mars, Mercury, Minerva, Mithras, Momus,
   Neptune, Nike, Olympians, Olympic gods, Ops, Orcus, Persephassa,
   Persephone, Phoebus, Phoebus Apollo, Pluto, Poseidon, Proserpina,
   Proserpine, Rhea, Saturn, Tellus, Venus, Vesta, Vulcan, Wayland,
   Zeus, farrier, forger, metalworker, smith