The Collaborative International Dictionary of English v.0.48:

Curator \Cu*ra"tor\ (k?-r?"t?r). n. [L., fr. curare to take care
   of, fr. cura care.]
   1. One who has the care and superintendence of anything, as
      of a museum; a custodian; a keeper.
      [1913 Webster]

   2. One appointed to act as guardian of the estate of a person
      not legally competent to manage it, or of an absentee; a
      trustee; a guardian.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

105 Moby Thesaurus words for "curator":
   MC, accountant, air warden, attendant, attorney, auditor, bailiff,
   bibliognost, bibliographer, biblioklept, bibliolater, bibliomane,
   bibliomaniac, bibliopegist, bibliophage, bibliophile, bibliopole,
   bibliopolist, bibliotaph, bibliothec, bibliothecaire,
   bibliothecary, book agent, book collector, book printer,
   book publisher, book salesman, book-stealer, bookbinder,
   bookdealer, bookkeeper, booklover, bookmaker, bookman, bookseller,
   bookworm, bursar, butler, caretaker, cashier, cashkeeper,
   castellan, cataloger, chamberlain, chief librarian, college editor,
   comptroller, conservator, controller, copy editor, croupier,
   custodian, depositary, depository, dictionary editor, editor,
   editor-in-chief, emcee, executive editor, factor,
   financial officer, forest ranger, game warden, gamekeeper,
   governor, guardian, guardian angel, housekeeper, janitor,
   juvenile editor, keeper, landreeve, librarian, library director,
   lifeguard, lifesaver, liquidator, majordomo, managing editor,
   master of ceremonies, next friend, paymaster, permissions editor,
   philobiblist, printer, prochein ami, proctor, procurator,
   production editor, publisher, purse bearer, purser, ranger,
   receiver, reference editor, reference librarian, seneschal,
   shepherd, steward, textbook editor, trade editor, treasurer,
   trustee, warden, warder