The Collaborative International Dictionary of English v.0.48:

Jackstone \Jack"stone`\, n.
   1. One of the pebbles or pieces used in the game of
      jackstones.
      [1913 Webster]

   2. (pl.) A game played with five small stones or pieces of
      metal. See 6th Chuck. Also called jacks. See
      jack[12], n.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

carangid \carangid\ n.
   any fish of the family Carangidae, including the
   cavallas, jacks, pompanos and scads.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

jacks
    n 1: a game in which jackstones are thrown and picked up in
         various groups between bounces of a small rubber ball [syn:
         jacks, jackstones, knucklebones]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "jacks":
   agate, ball, baseball bat, bat, battledore, bauble, blocks,
   checkerboard, chessboard, club, cockhorse, cricket bat, cue, doll,
   doll carriage, gewgaw, gimcrack, golf club, hobbyhorse,
   jack-in-the-box, jackstones, jackstraws, kickshaw, knickknack,
   marble, marionette, mig, paper doll, pick-up sticks, pinwheel,
   plaything, puppet, racket, rag doll, rocking horse, sport, steelie,
   taw, teetotum, top, toy, toy soldier, trinket, whim-wham