The Collaborative International Dictionary of English v.0.48:

Plaything \Play"thing`\, n.
   A thing to play with; a toy; anything that serves to amuse.
   [1913 Webster]

         A child knows his nurse, and by degrees the playthings
         of a little more advanced age.           --Locke.
   [1913 Webster]

WordNet (r) 3.0 (2006):

plaything
    n 1: an artifact designed to be played with [syn: plaything,
         toy]

Moby Thesaurus II by Grady Ward, 1.0:

110 Moby Thesaurus words for "plaything":
   Charlie McCarthy, agate, agent, ancilla, appliance, babe, ball,
   baseball bat, bat, battledore, bauble, blocks, boob, checkerboard,
   chessboard, chump, cinch, club, cockhorse, contrivance, creature,
   credulous person, cricket bat, cue, cull, device, die, doll,
   doll carriage, dummy, dupe, easy mark, easy pickings, fall guy,
   fish, fool, game, gewgaw, gimcrack, go-between, gobe-mouches,
   golf club, greener, greenhorn, greeny, gudgeon, gull, handmaid,
   handmaiden, hobbyhorse, implement, innocent, instrument,
   interagent, intermediary, intermediate, intermedium,
   jack-in-the-box, jacks, jackstones, jackstraws, kickshaw,
   knickknack, leadpipe cinch, lever, marble, marionette, mechanism,
   mediator, medium, midwife, mig, minion, monkey, organ, paper doll,
   pastime, patsy, pawn, pick-up sticks, pigeon, pinwheel, pretty,
   prize sap, puppet, pushover, racket, rag doll, rocking horse, sap,
   saphead, schlemiel, servant, sitting duck, slave, sport, steelie,
   stooge, sucker, taw, teetotum, tool, top, toy, toy soldier,
   trinket, trusting soul, vehicle, victim, whim-wham