The Collaborative International Dictionary of English v.0.48:

Else \Else\, adv. & conj.
   1. Besides; except that mentioned; in addition; as, nowhere
      else; no one else.
      [1913 Webster]

   2. Otherwise; in the other, or the contrary, case; if the
      facts were different.
      [1913 Webster]

            For thou desirest not sacrifice; else would I give
            it.                                   --Ps. li. 16.
      [1913 Webster]

   Note: After `or', else is sometimes used expletively, as
         simply noting an alternative. "Will you give thanks, .
         . . or else shall I?" --Shak.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Else \Else\, a. & pron. [OE. & AS. elles otherwise, gen. sing.
   of an adj. signifying other; akin to OHG. elles otherwise,
   OSw. [aum]ljes, Sw. eljest, Goth. aljis, adj., other, L.
   alius, Gr. ?. Cf. Alias, Alien.]
   Other; one or something beside; as, Who else is coming? What
   else shall I give? Do you expect anything else? "Bastards and
   else." --Shak.
   [1913 Webster]

   Note: This word always follows its noun. It is usual to give
         the possessive form to else rather than to the
         substantive; as, somebody else's; no one else's. "A boy
         who is fond of somebody else's pencil case." --G.
         Eliot. "A suit of clothes like everybody else's."
         --Thackeray.
         [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

63 Moby Thesaurus words for "else":
   above, added, additionally, again, alias, all included, also,
   altogether, among other things, and all, and also, and so, another,
   as well, au reste, beside, besides, beyond, contrarily, elsewise,
   en plus, extra, farther, for lagniappe, fresh, further,
   furthermore, in addition, in other respects, in other ways,
   inter alia, into the bargain, item, likewise, more, moreover, new,
   not that sort, not the same, not the type, of a sort,
   of another sort, of sorts, on the side, on top of, or else, other,
   other than, otherwise, over, peculiar, plus, rare, similarly,
   special, sui generis, than, then, therewith, to boot, too, unique,
   yet