diver

from WordNet (r) 3.0 (2006)

diver
    n 1: someone who works underwater [syn: {diver}, {frogman},
         {underwater diver}]
    2: someone who dives (into water) [syn: {diver}, {plunger}]
    3: large somewhat primitive fish-eating diving bird of the
       northern hemisphere having webbed feet placed far back;
       related to the grebes [syn: {loon}, {diver}]

from The Collaborative International Dictionary of English v.0.48

Diver \Div"er\, n.
   1. One who, or that which, dives.
      [1913 Webster]

            Divers and fishers for pearls.        --Woodward.
      [1913 Webster]

   2. Fig.: One who goes deeply into a subject, study, or
      business. "A diver into causes." --Sir H. Wotton.
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   3. (Zool.) Any bird of certain genera, as {Urinator}
      (formerly {Colymbus}), or the allied genus {Colymbus}, or
      {Podiceps}, remarkable for their agility in diving.
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   Note: The northern diver ({Urinator imber}) is the loon; the
         black diver or velvet scoter ({Oidemia fusca}) is a sea
         duck. See {Loon}, and {Scoter}.
         [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

22 Moby Thesaurus words for "diver":
      bather, bathing beauty, bathing girl, cannon, cutpurse,
      deep-sea diver, dip, free diver, frogman, jumper, mermaid, merman,
      natator, parachute jumper, pearl diver, plunger, scuba diver,
      skin diver, sky diver, snorkel diver, swimmer, wire