The Collaborative International Dictionary of English v.0.48:
Vaunter \Vaunt"er\, n. One who vaunts; a boaster. [1913 Webster]WordNet (r) 3.0 (2006):
vaunter n 1: a very boastful and talkative person [syn: bragger, braggart, boaster, blowhard, line-shooter, vaunter]