WordNet (r) 3.0 (2006):

Helios
    n 1: (Greek mythology) ancient god of the sun; drove his chariot
         across the sky each day; identified with Roman Sol

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "Helios":
   Agdistis, Amen-Ra, 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, Hephaestus, 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, Ra, Rhea, Saturn, Savitar, Shamash, Sol, Surya, Tellus,
   Titan, Venus, Vesta, Vulcan, Zeus