The Collaborative International Dictionary of English v.0.48:

Nought \Nought\, n. & adv.
   See Naught. --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Naught \Naught\ (n[add]t), n. [OE. naught, nought, naht, nawiht,
   AS. n[=a]wiht, n[=a]uht, n[=a]ht; ne not + [=a] ever + wiht
   thing, whit; hence, not ever a whit. See No, adv. Whit,
   and cf. Aught, Not.]
   1. Nothing. [Written also nought.]
      [1913 Webster]

            Doth Job fear God for naught?         --Job i. 9.
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   2. The arithmetical character 0; a cipher. See Cipher.
      [1913 Webster]

   To set at naught, to treat as of no account; to disregard;
      to despise; to defy; to treat with ignominy. "Ye have set
      at naught all my counsel." --Prov. i. 25.
      [1913 Webster]

WordNet (r) 3.0 (2006):

nought
    n 1: a mathematical element that when added to another number
         yields the same number [syn: zero, 0, nought,
         cipher, cypher]

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "nought":
   a little thing, aught, cipher, goose egg, hardly anything,
   inessential, insignificancy, marginal matter,
   matter of indifference, mere nothing, minor matter, nada, naught,
   nichts, nihil, nihility, nil, nix, no great matter, no such thing,
   nothing, nothing at all, nothing in particular, nothing on earth,
   nothing to signify, nothing whatever, nullity, paltry affair,
   peu de chose, rien du tout, scarcely anything, technicality,
   thing of naught, zero, zilch