WordNet (r) 3.0 (2006):

tons
    n 1: a large number or amount; "made lots of new friends"; "she
         amassed stacks of newspapers" [syn: tons, dozens,
         heaps, lots, piles, scores, stacks, loads,
         rafts, slews, wads, oodles, gobs, scads,
         lashings]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "tons":
   abundance, acres, bags, barrels, bushel, copiousness,
   countlessness, flood, load, mass, mountain, much, multitude,
   numerousness, ocean, oceans, peck, plenitude, plenty, profusion,
   quantities, quantity, sea, spate, superabundance, superfluity,
   volume, world, worlds