This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One who, or that which, denounces.

n. One who denounces, or declares, as a menace.

n. One who denounces; one who threatens or menaces.

n. One who endeavors to obtain possession of or right to a mine or other land by denouncement.

"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."

fulminator    inveigher    vituperator   

irreconcilability    fisc    egging    asserter    perdu