[1] : The Collaborative International Dictionary of English v.0.48

pants \pants\ n.
   1. n. pl. a garment extending from the waist to the knee or
      ankle, covering each leg separately.

   syn: trousers.
        wordnet 1.6

   2. underpants.

   syn: drawers.
        pjc

   3. specifically: underpants worn by women; panties.

   syn: bloomers, drawers, panties.
        wordnet 1.6

[2] : WordNet (r) 2.0

pants
     n 1: usually in the plural a garment extending from the waist
          to the knee or ankle, covering each leg separately; "he
          had a sharp crease in his trousers" syn: trousers
     2: usually in the plural underpants worn by women; "she was
        afraid that her bloomers might have been showing" syn: bloomers,
         drawers, knickers
see also:
trousers bloomers drawers knickers 

[3] : Moby Thesaurus II by Grady Ward, 1.0

49 moby thesaurus words for "pants":
   bermuda shorts, capri pants, bags, bells, bloomers, blue jeans,
   breeches, breeks, briefs, britches, buckskins, chivarras,
   clam diggers, cords, corduroys, culottes, denims, drawers,
   dungarees, flannels, hot pants, jeans, jodhpurs, knee breeches,
   knickerbockers, knickers, overalls, pair of trousers, pajamas,
   pantalets, pantaloons, panties, peg pants, pegtops, plus-fours,
   rompers, sacks, shintiyan, shorts, slacks, smallclothes, tights,
   trews, trousers, trunks, tweeds, underpants, undies, whites

Pants >> P Words
Pants, definition of term: Pants
pants_pag1.html

Sweat Pants >> S Words
Sweat Pants, definition of term: Sweat Pants
sweat+pants_pag1.html

Short Pants >> S Words
Short Pants, definition of term: Short Pants
short+pants_pag1.html

Bikini Pants >> B Words
Bikini Pants, definition of term: Bikini Pants
bikini+pants_pag1.html

Hot Pants >> H Words
Hot Pants, definition of term: Hot Pants
hot+pants_pag1.html