Source : Webster's Revised Unabridged Dictionary (1913)

Boaster \Boast"er\, n.
   One who boasts; a braggart.

Boaster \Boast"er\, n.
   A stone mason's broad-faced chisel.

Source : WordNet®

boaster
     n : a very boastful and talkative person [syn: {bragger}, {braggart},
          {blowhard}, {line-shooter}, {vaunter}]