'Vociferator' definitions:

Definition of 'vociferator'

From: WordNet
noun
A loud and vehement speaker (usually in protest)

Definition of 'Vociferator'

From: GCIDE
  • Vociferator \Vo*cif"er*a`tor\, n. One who vociferates, or is clamorous. [R.] [1913 Webster]