Besides

• POS: Preposition, Adverb
• HYPHEN: be=sides

CIDE DICTIONARY

Besides, adv. [OE. Same as beside, prep.; the ending -s is an adverbial one, prop. a genitive sign.].

•  On one side.  Chaucer. Shak.  [1913 Webster]
•  More than that; over and above; not included in the number, or in what has been mentioned; moreover; in addition.  [1913 Webster]

  " These sentences may be considered as elliptical."  [1913 Webster]

  "The men said unto Lot, Hast thou here any besides ?"  [1913 Webster]

  "To all beside, as much an empty shade,
  An Eugene living, as a Cæsar dead."  [1913 Webster]

Besides, prep. 

 Over and above; separate or distinct from; in addition to; other than; else than. See Beside, prep., 3, and Syn. under Beside.  [1913 Webster]
"Besides your cheer, you shall have sport."  [1913 Webster]

OXFORD DICTIONARY

Besides, prep. & adv.
--prep. in addition to; apart from.
--adv. also; as well; moreover.

THESAURUS

Besides

above and beyond, added, additionally, along, along with, also, apart from, as well, as well as, aside from, bar, barring, beside, beyond, but, else, except for, excepting, excluding, exclusive of, farther, further, furthermore, in addition, in addition to, into the bargain, likewise, more, moreover, new, not counting, other, other than, otherwise, outside of, over and above, save, then, to boot, together with, too, yet

ROGET THESAURUS

Besides

Addition

N addition, annexation, adjection, junction, superposition, superaddition, superjunction, superfetation, accession, reinforcement, increase, increment, supplement, accompaniment, interposition, insertion, added, additional, supplemental, supplementary, suppletory, subjunctive, adjectitious, adscititious, ascititious, additive, extra, accessory, au reste, in addition, more, plus, extra, and, also, likewise, too, furthermore, further, item, and also, and eke, else, besides, to boot, et cetera, and so on, and so forth, into the bargain, cum multis aliis, over and above, moreover, with, withal, including, inclusive, as well as, not to mention, let alone, together with, along with, coupled with, in conjunction with, conjointly, jointly, adde parvum parvo magnus acervus erit.