avower

from WordNet (r) 3.0 (2006)

avower
    n 1: someone who admits or acknowledges openly and boldly
    2: someone who claims to speak the truth; "a bold asserter"; "a
       declarer of his intentions"; "affirmers of traditional
       doctrine"; "an asseverator of strong convictions"; "an avower
       of his own great intelligence" [syn: {asserter}, {declarer},
       {affirmer}, {asseverator}, {avower}]

from The Collaborative International Dictionary of English v.0.48

Avower \A*vow"er\, n.
   One who avows or asserts.
   [1913 Webster]