WordNet (r) 3.0 (2006):

Dionysus
    n 1: (Greek mythology) god of wine and fertility and drama; the
         Greek name of Bacchus

Moby Thesaurus II by Grady Ward, 1.0:

100 Moby Thesaurus words for "Dionysus":
   Agdistis, Amor, Aphrodite, Apollo, Apollon, Ares, Artemis,
   Ashtoreth, Astarte, Ate, Athena, Baal, Bacchus, Ceres, Cora,
   Cronus, Cupid, Cybele, Demeter, Despoina, Diana, Dionysos, Dis,
   Eros, Flora, Frey, Gaea, Gaia, Ge, Great Mother, Hades, Helios,
   Hephaestus, Hera, Here, Hermes, Hestia, Hymen, Hyperion, Isis,
   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, Pan,
   Persephassa, Persephone, Phoebus, Phoebus Apollo, Pluto, Pomona,
   Poseidon, Priapus, Proserpina, Proserpine, Rhea, Saturn, Tellus,
   Triptolemos, Triptolemus, Venus, Vesta, Vulcan, Zeus, angel,
   bacchanalianism, backer, bibaciousness, bibacity, bibulosity,
   bibulousness, corn god, crapulence, crapulousness, fertility god,
   forest god, intemperance, patron, patroness, serious drinking,
   sottishness, vegetation spirit