WordNet (r) 3.0 (2006):

Big Dipper
    n 1: a group of seven bright stars in the constellation Ursa
         Major [syn: Big Dipper, Dipper, Plough, Charles's
         Wain, Wain, Wagon]
    2: elevated railway in an amusement park (usually with sharp
       curves and steep inclines) [syn: roller coaster, big
       dipper, chute-the-chute]

Moby Thesaurus II by Grady Ward, 1.0:

96 Moby Thesaurus words for "Big Dipper":
   Antlia, Antlia Pneumatica, Apus, Aquarius, Ara, Caela Sculptoris,
   Caelum, Camelopardus, Cancer, Columba Noae, Corona Australis,
   Corona Borealis, Corvus, Crater, Crux, Dorado, Draco, Equuleus,
   Gemini, Grus, Hercules, Horologium, Hydra, Lacerta, Leo, Leo Minor,
   Lepus, Libra, Little Dipper, Lupus, Lynx, Lyra, Malus, Mensa,
   Microscopium, Monoceros, Musca, Norma, Northern Cross, Octans,
   Ophiuchus, Orion, Pegasus, Phoenix, Reticulum, Sagittarius,
   Scorpius, Sculptor, Scutum, Sextans, Southern Cross, Taurus,
   Telescopium, Triangulum, Triangulum Australe, Tucana, Ursa Major,
   Ursa Minor, Vela, Virgo, Volans, Vulpecula, the Balance, the Bull,
   the Crane, the Cross, the Crow, the Cup, the Dragon, the Fly,
   the Foal, the Hare, the Indian, the Lion, the Lizard, the Lynx,
   the Lyre, the Mast, the Octant, the Rule, the Sails,
   the Sea Serpent, the Serpent, the Serpent Bearer, the Sextant,
   the Southern Crown, the Swan, the Table, the Telescope, the Toucan,
   the Twins, the Unicorn, the Virgin, the Water Bearer, the Wolf,
   the Wreath