The Collaborative International Dictionary of English v.0.48:

Mover \Mov"er\, n.
   1. A person or thing that moves, stirs, or changes place.
      [1913 Webster]

   2. A person or thing that imparts motion, or causes change of
      place; a motor.
      [1913 Webster]

   3. One who, or that which, excites, instigates, or causes
      movement, change, etc.; as, movers of sedition.
      [1913 Webster]

            These most poisonous compounds,
            Which are the movers of a languishing death. --Shak.
      [1913 Webster]

   4. A proposer; one who offers a proposition, or recommends
      anything for consideration or adoption; as, the mover of a
      resolution in a legislative body.
      [1913 Webster]

WordNet (r) 3.0 (2006):

mover
    n 1: workman employed by a moving company; "the movers were very
         careful with the grand piano"
    2: (parliamentary procedure) someone who makes a formal motion
       [syn: proposer, mover]
    3: someone who moves
    4: a company that moves the possessions of a family or business
       from one site to another [syn: mover, public mover,
       moving company, removal firm, removal company]

Moby Thesaurus II by Grady Ward, 1.0:

128 Moby Thesaurus words for "mover":
   Ahasuerus, Ancient Mariner, Argonaut, Flying Dutchman, Goliard,
   Odysseus, Oisin, Ossian, Ulysses, abettor, actor, actuator, agent,
   agitator, ancestors, animator, apprentice, architect, artificer,
   artist, author, begetter, beginner, bird of passage, builder,
   cajoler, catalyst, causer, coax, coaxer, conceiver, constructor,
   craftsman, creator, designer, deviser, discoverer, doer, drifter,
   effector, encourager, energizer, engenderer, engineer, executant,
   executor, executrix, fabricator, father, firer, floater, fomenter,
   founder, gad, gadabout, gadfly, galvanizer, generator, go-about,
   grower, impeller, inaugurator, inciter, inducer, industrialist,
   initiator, inspirer, instigator, institutor, introducer, inventor,
   itinerant, journeyman, maker, manufacturer, master,
   master craftsman, medium, mother, moving spirit, operant,
   operative, operator, organizer, originator, parent, past master,
   peregrinator, peregrine, performer, peripatetic, perpetrator,
   persuader, planner, pleader, practitioner, precursor, prime mover,
   primum mobile, producer, prompter, raiser, rambler, realizer,
   roamer, rolling stone, rover, runabout, shaper, sire, smith, spark,
   spark plug, sparker, stimulator, straggler, stroller,
   strolling player, subject, tempter, troubadour, visitant, wanderer,
   wandering minstrel, wandering scholar, wheedler, worker, wright