The Collaborative International Dictionary of English v.0.48:

Than \Than\ ([th][a^]n), conj. [OE. than, thon, then, thanne,
   thonne, thenne, than, then, AS. [eth]anne, [eth]onne,
   [eth]aenne; akin to D. dan, OHG. danne, G. dann then, denn
   than, for, Goth. [thorn]an then, and to E. the, there, that.
   See That, and cf. Then.]
   A particle expressing comparison, used after certain
   adjectives and adverbs which express comparison or diversity,
   as more, better, other, otherwise, and the like. It is
   usually followed by the object compared in the nominative
   case. Sometimes, however, the object compared is placed in
   the objective case, and than is then considered by some
   grammarians as a preposition. Sometimes the object is
   expressed in a sentence, usually introduced by that; as, I
   would rather suffer than that you should want.
   [1913 Webster]

         Behold, a greater than Solomon is here.  --Matt. xii.
                                                  42.
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         Which when Beelzebub perceived, than whom,
         Satan except, none higher sat.           --Milton.
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         It's wiser being good than bad;
         It's safer being meek than fierce;
         It's fitter being sane than mad.         --R. Browning.
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The Collaborative International Dictionary of English v.0.48:

Than \Than\, adv.
   Then. See Then. [Obs.] --Gower.
   [1913 Webster]

         Thanne longen folk to gon on pilgrimages. --Chaucer.
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Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "than":
   alias, as compared with, aside from, bar, barring, beside, besides,
   by comparison with, compared with, contrarily, else, elsewise, ex,
   except, except for, excepting, excluding, exclusive of,
   in comparison with, in other respects, in other ways, leaving out,
   let alone, omitting, or else, other than, otherwise, outside of,
   over against, precluding, save, save and except, saving,
   taken with, unless, without