The Collaborative International Dictionary of English v.0.48:

Institutor \In"sti*tu`tor\, n. [L.: cf. F. instituteur.]
   [1913 Webster]
   1. One who institutes, founds, ordains, or establishes.
      [1913 Webster]

   2. One who educates; an instructor. [Obs.] --Walker.
      [1913 Webster]

   3. (Episcopal Church) A presbyter appointed by the bishop to
      institute a rector or assistant minister over a parish
      church.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "institutor":
   ancestors, apprentice, architect, artificer, artist, author,
   begetter, beginner, builder, conceiver, constructor, craftsman,
   creator, designer, deviser, discoverer, effector, engenderer,
   engineer, executor, executrix, father, founder, generator, grower,
   inaugurator, industrialist, initiator, instigator, introducer,
   inventor, journeyman, maker, manufacturer, master,
   master craftsman, mother, organizer, originator, past master,
   planner, precursor, prime mover, producer, raiser, realizer,
   shaper, sire, smith, wright