The Collaborative International Dictionary of English v.0.48:
Reprover \Re*prov"er\ (r?-pr??v"?r), n. One who, or that which, reproves. [1913 Webster]WordNet (r) 3.0 (2006):
reprover n 1: someone who finds fault or imputes blame [syn: upbraider, reprover, reproacher, rebuker]