The Collaborative International Dictionary of English v.0.48:

Barker \Bark"er\, n.
   1. An animal that barks; hence, any one who clamors
      unreasonably.
      [1913 Webster]

   2. One who stands at the doors of shops to urg? passers by to
      make purchases. [Cant, Eng.]
      [1913 Webster]

   3. A pistol. [Slang] --Dickens.
      [1913 Webster]

   4. (Zool.) The spotted redshank.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Barker \Bark"er\, n.
   One who strips trees of their bark.
   [1913 Webster]

WordNet (r) 3.0 (2006):

barker
    n 1: someone who stands in front of a show (as at a carnival)
         and gives a loud colorful sales talk to potential customers
    2: informal terms for dogs [syn: pooch, doggie, doggy,
       barker, bow-wow]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "barker":
   MC, auteur, ballyhoo man, ballyhooer, callboy, canvasser,
   costume designer, costumer, costumier, director, emcee,
   equestrian director, exhibitor, impresario, makeup man,
   master of ceremonies, pitchman, playreader, producer, prompter,
   ringmaster, scenewright, set designer, showman, solicitor, spieler,
   stage director, stage manager, theater man, theatrician,
   ticket collector, tout, touter, usher, usherer, usherette



U.S. Gazetteer Places (2000):

Barker, NY -- U.S. village in New York
   Population (2000):    577
   Housing Units (2000): 234
   Land area (2000):     0.420455 sq. miles (1.088974 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.420455 sq. miles (1.088974 sq. km)
   FIPS code:            04440
   Located within:       New York (NY), FIPS 36
   Location:             43.327466 N, 78.553592 W
   ZIP Codes (1990):     14012
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Barker, NY
    Barker