Source : WordNet®

squawker
     n 1: a person given to excessive complaints and crying and
          whining [syn: {whiner}, {complainer}, {moaner}, {sniveller},
           {crybaby}, {bellyacher}, {grumbler}]
     2: the loudspeaker on an inter-com or public address system
        [syn: {squawk box}, {intercom speaker}]