The Collaborative International Dictionary of English v.0.48:

Scoff \Scoff\, v. i. [imp. & p. p. Scoffed (?; 115); p. pr. &
   vb. n. Scoffing.] [Cf. Dan. skuffe to deceive, delude,
   Icel. skopa to scoff, OD. schoppen. See Scoff, n.]
   To show insolent ridicule or mockery; to manifest contempt by
   derisive acts or language; -- often with at.
   [1913 Webster]

         Truth from his lips prevailed with double sway,
         And fools who came to scoff, remained to pray.
                                                  --Goldsmith.
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         God's better gift they scoff at and refuse. --Cowper.
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   Syn: To sneer; mock; gibe; jeer. See Sneer.
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The Collaborative International Dictionary of English v.0.48:

Scoff \Scoff\, v. t.
   To treat or address with derision; to assail scornfully; to
   mock at.
   [1913 Webster]

         To scoff religion is ridiculously proud and immodest.
                                                  --Glanvill.
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The Collaborative International Dictionary of English v.0.48:

Scoff \Scoff\ (?; 115), n. [OE. scof; akin to OFries. schof,
   OHG. scoph, Icel. skaup, and perh. to E. shove.]
   1. Derision; ridicule; mockery; derisive or mocking
      expression of scorn, contempt, or reproach.
      [1913 Webster]

            With scoffs, and scorns, and contumelious taunts.
                                                  --Shak.
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   2. An object of scorn, mockery, or derision.
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            The scoff of withered age and beardless youth.
                                                  --Cowper.
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WordNet (r) 3.0 (2006):

scoff
    n 1: showing your contempt by derision [syn: jeer, jeering,
         mockery, scoff, scoffing]
    v 1: laugh at with contempt and derision; "The crowd jeered at
         the speaker" [syn: jeer, scoff, flout, barrack,
         gibe]
    2: treat with contemptuous disregard; "flout the rules" [syn:
       scoff, flout]

Moby Thesaurus II by Grady Ward, 1.0:

103 Moby Thesaurus words for "scoff":
   Parthian shot, affront, aspersion, atrocity, back answer, barrack,
   belittle, bolt, boo, brickbat, caustic remark, chaff, chow,
   comeback, comestibles, contempt, contumely, crack, cut, cut at,
   cutting remark, deride, despite, devour, dig, dig at, disbelieve,
   dismiss, disparage, dump on, eats, edibles, enormity, feed, fleer,
   flout, flouting, food, foodstuff, foolery, gibe, gibing retort,
   gird, gobble up, grub, gulp down, guzzle, humiliation, indignity,
   injury, insult, jab, jab at, jape, jeer, jeer at, jeering, jest,
   kid, lampoon, leg-pull, make light of, mock, mockery, offense,
   outrage, parting shot, poke fun at, pooh, pooh-pooh, provisions,
   put away, put down, put-down, put-on, quip, rag, rail at, rally,
   rank out, rations, revile, rib, ridicule, rude reproach, scoff at,
   scout, scurrility, short answer, slam, slap, slap at, sneer,
   sneer at, spoof, swipe, taunt, tease, twit, uncomplimentary remark,
   verbal thrust, victuals, wolf down