The Collaborative International Dictionary
Denouncer
Denouncer \De*noun"cer\n. One who denounces, or declares, as a menace.
Here comes the sad denouncer of my fate.
--Dryden.
Wiktionary
denouncer
n. One who, or that which, denounces.
Usage examples of "denouncer".
It did harbor one notable holy figure, Brigitta of Sweden, who was kind and meek to every creature, but a passionate denouncer of the corruption of the hierarchy.
And all the worse for the doomed man, that the denouncer was a well-known citizen, his own attached friend, the father of his wife.