The Collaborative International Dictionary of English v.0.48:

Spear \Spear\, v. t. [imp. & p. p. Speared; p. pr. & vb. n.
   Spearing.]
   To pierce with a spear; to kill with a spear; as, to spear a
   fish.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spear \Spear\, v. i.
   To shoot into a long stem, as some plants. See Spire.
   --Mortimer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spear \Spear\, n. [OE. spere, AS. spere; akin to D. & G. speer,
   OS. & OHS. sper, Icel. spj["o]r, pl., Dan. spaer, L. sparus.]
   1. A long, pointed weapon, used in war and hunting, by
      thrusting or throwing; a weapon with a long shaft and a
      sharp head or blade; a lance.

   Note: [See Illust. of Spearhead.] "A sharp ground spear."
         --Chaucer.
         [1913 Webster]

               They shall beat their swords into plowshares, and
               their spears into pruning hooks.   --Micah iv. 3.
         [1913 Webster]

   2. Fig.: A spearman. --Sir W. Scott.
      [1913 Webster]

   3. A sharp-pointed instrument with barbs, used for stabbing
      fish and other animals.
      [1913 Webster]

   4. A shoot, as of grass; a spire.
      [1913 Webster]

   5. The feather of a horse. See Feather, n., 4.
      [1913 Webster]

   6. The rod to which the bucket, or plunger, of a pump is
      attached; a pump rod.
      [1913 Webster]

   Spear foot, the off hind foot of a horse.

   Spear grass. (Bot.)
      (a) The common reed. See Reed, n., 1.
      (b) meadow grass. See under Meadow.

   Spear hand, the hand in which a horseman holds a spear; the
      right hand. --Crabb.

   Spear side, the male line of a family. --Lowell.

   Spear thistle (Bot.), the common thistle (Cnicus
      lanceolatus).
      [1913 Webster]

WordNet (r) 3.0 (2006):

spear
    n 1: a long pointed rod used as a tool or weapon [syn: spear,
         lance, shaft]
    2: an implement with a shaft and barbed point used for catching
       fish [syn: spear, gig, fizgig, fishgig, lance]
    v 1: pierce with a spear; "spear fish"
    2: thrust up like a spear; "The branch speared up into the air"
       [syn: spear, spear up]

Moby Thesaurus II by Grady Ward, 1.0:

159 Moby Thesaurus words for "spear":
   anthrophore, assegai, auger, axis, bag, bayonet, bill, bine, bite,
   blade, bole, bore, bough, bract, bracteole, bractlet, branch,
   branchedness, branchiness, broach, burgeon, cane, carpophore,
   catch, caudex, caulicle, caulis, cotyledon, countersink, culm,
   dagger, deadwood, dirk, drill, empierce, enmesh, ensnare, entangle,
   entrap, fix, flag, flagellum, floral leaf, foliole, footstalk,
   fork, foul, frond, funicule, funiculus, glume, gore, gouge,
   gouge out, halberd, harpoon, haulm, hole, honeycomb, hook, impale,
   involucre, involucrum, javelin, knife, lamina, lance, land, lasso,
   leaf, leaflet, leafstalk, lemma, ligule, limb, mesh, nail, needle,
   net, noose, offshoot, partisan, pedicel, peduncle, penetrate,
   perforate, petal, petiole, petiolule, petiolus, pierce, pike, pile,
   pine needle, pink, plunge in, poniard, prick, punch, puncture,
   ramage, ramification, ream, ream out, reed, riddle, rope,
   run through, runner, saber, sack, sarment, scion, seed leaf,
   seedstalk, sepal, shoot, skewer, slip, snag, snare, sniggle,
   spathe, spike, spire, spit, spontoon, spray, sprig, sprit, sprout,
   stab, stalk, stem, stick, stiletto, stipe, stipula, stipule, stock,
   stolon, straw, sucker, switch, sword, take, tangle, tangle up with,
   tap, tendril, thallus, tigella, transfix, transpierce, trap,
   trepan, trephine, trunk, twig