One who reproves; who rebukes is a kind tone. (noun)
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Use "reprover" in a sentence
"Like an earring of gold and an ornament of fine gold is a wise reprover to a listening ear."
"The sensibility of Lord Valhurst was not of sufficient magnitude to separate into two courses: the little he possessed was already occupied by his disappointment, in losing the beautiful prey he believed just falling into his hands, and he had no emotion, therefore, to bestow upon his young reprover."
"And I will make thy tongue cleave to the roof of thy mouth, that thou shalt be dumb, and shalt not be to them a reprover: for they are a rebellious house."