vociferator

from WordNet (r) 3.0 (2006)
vociferator
    n 1: a loud and vehement speaker (usually in protest)
from The Collaborative International Dictionary of English v.0.48
Vociferator \Vo*cif"er*a`tor\, n.
   One who vociferates, or is clamorous. [R.]
   [1913 Webster]
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