The Collaborative International Dictionary of English v.0.48:

Hag \Hag\ (h[a^]g), n. [OE. hagge, hegge, witch, hag, AS.
   h[ae]gtesse; akin to OHG. hagazussa, G. hexe, D. heks, Dan.
   hex, Sw. h[aum]xa. The first part of the word is prob. the
   same as E. haw, hedge, and the orig. meaning was perh., wood
   woman, wild woman. [root]12.]
   1. A witch, sorceress, or enchantress; also, a wizard. [Obs.]
      "[Silenus] that old hag." --Golding.
      [1913 Webster]

   2. An ugly old woman. --Dryden.
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   3. A fury; a she-monster. --Crashaw.
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   4. (Zool.) An eel-like marine marsipobranch (Myxine
      glutinosa), allied to the lamprey. It has a suctorial
      mouth, with labial appendages, and a single pair of gill
      openings. It is the type of the order Hyperotreta.
      Called also hagfish, borer, slime eel, sucker, and
      sleepmarken.
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   5. (Zool.) The hagdon or shearwater.
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   6. An appearance of light and fire on a horse's mane or a
      man's hair. --Blount.
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   Hag moth (Zool.), a moth (Phobetron pithecium), the larva
      of which has curious side appendages, and feeds on fruit
      trees.

   Hag's tooth (Naut.), an ugly irregularity in the pattern of
      matting or pointing.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sucker \Suck"er\ (s[u^]k"[~e]r), n.
   1. One who, or that which, sucks; esp., one of the organs by
      which certain animals, as the octopus and remora, adhere
      to other bodies.
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   2. A suckling; a sucking animal. --Beau. & Fl.
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   3. The embolus, or bucket, of a pump; also, the valve of a
      pump basket. --Boyle.
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   4. A pipe through which anything is drawn.
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   5. A small piece of leather, usually round, having a string
      attached to the center, which, when saturated with water
      and pressed upon a stone or other body having a smooth
      surface, adheres, by reason of the atmospheric pressure,
      with such force as to enable a considerable weight to be
      thus lifted by the string; -- used by children as a
      plaything.
      [1913 Webster]

   6. (Bot.) A shoot from the roots or lower part of the stem of
      a plant; -- so called, perhaps, from diverting nourishment
      from the body of the plant.
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   7. (Zool.)
      (a) Any one of numerous species of North American
          fresh-water cyprinoid fishes of the family
          Catostomidae; so called because the lips are
          protrusile. The flesh is coarse, and they are of
          little value as food. The most common species of the
          Eastern United States are the northern sucker
          (Catostomus Commersoni), the white sucker
          (Catostomus teres), the hog sucker (Catostomus
          nigricans), and the chub, or sweet sucker (Erimyzon
          sucetta). Some of the large Western species are
          called buffalo fish, red horse, black horse, and
          suckerel.
      (b) The remora.
      (c) The lumpfish.
      (d) The hagfish, or myxine.
      (e) A California food fish (Menticirrus undulatus)
          closely allied to the kingfish
      (a); -- called also bagre.
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   8. A parasite; a sponger. See def. 6, above.
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            They who constantly converse with men far above
            their estates shall reap shame and loss thereby; if
            thou payest nothing, they will count thee a sucker,
            no branch.                            --Fuller.
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   9. A hard drinker; a soaker. [Slang]
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   10. A greenhorn; someone easily cheated, gulled, or deceived.
       [Slang, U.S.]
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   11. A nickname applied to a native of Illinois. [U. S.]
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   12. A person strongly attracted to something; -- usually used
       with for; as, he's a sucker for tall blondes.
       [PJC]

   11. Any thing or person; -- usually implying annoyance or
       dislike; as, I went to change the blade and cut my finger
       on the sucker. [Slang]
       [PJC]

   Carp sucker, Cherry sucker, etc. See under Carp,
      Cherry, etc.

   Sucker fish. See Sucking fish, under Sucking.

   Sucker rod, a pump rod. See under Pump.

   Sucker tube (Zool.), one of the external ambulacral tubes
      of an echinoderm, -- usually terminated by a sucker and
      used for locomotion. Called also sucker foot. See
      Spatangoid.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sucker \Suck"er\, v. t. [imp. & p. p. Suckered; p. pr. & vb.
   n. Suckering.]
   1. To strip off the suckers or shoots from; to deprive of
      suckers; as, to sucker maize.
      [1913 Webster]

   2. To cheat or deceive (a gullible person); to make a sucker
      of (someone).
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Sucker \Suck"er\, v. i.
   To form suckers; as, corn suckers abundantly.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sucker
    n 1: a person who is gullible and easy to take advantage of
         [syn: chump, fool, gull, mark, patsy, fall guy,
         sucker, soft touch, mug]
    2: a shoot arising from a plant's roots
    3: a drinker who sucks (as at a nipple or through a straw)
    4: flesh of any of numerous North American food fishes with
       toothless jaws
    5: hard candy on a stick [syn: lollipop, sucker, all-day
       sucker]
    6: an organ specialized for sucking nourishment or for adhering
       to objects by suction
    7: mostly North American freshwater fishes with a thick-lipped
       mouth for feeding by suction; related to carps

Moby Thesaurus II by Grady Ward, 1.0:

96 Moby Thesaurus words for "sucker":
   babe, barnacle, beat, bilk, bine, bloodsucker, boob, bough, branch,
   branchedness, branchiness, burgeon, butt, chump, cinch, client,
   cozen, credulous person, cull, customer, deadwood, defraud, diddle,
   do, dupe, easy mark, easy pickings, fair game, fall guy, fish,
   flagellum, fool, fork, freeloader, frond, goat, gobe-mouches,
   greener, greenhorn, greeny, gudgeon, gull, gyp, hanger-on,
   innocent, leadpipe cinch, leech, limb, lounge lizard, mark, monkey,
   mug, offshoot, overreach, patron, patsy, pigeon, plaything,
   prize sap, prospect, pushover, ramage, ramification, regular,
   regular customer, runner, sap, saphead, sapling, sarment,
   schlemiel, scion, seedling, set, shoot, sitting duck, slip,
   soft touch, spear, spiv, sponge, sponger, spray, sprig, sprit,
   sprout, stolon, stooge, switch, take, tendril, thallus, toy,
   trusting soul, twig, victim