Admonisher

ad·mon·ish  (d-mnsh)

tr.v. ad·mon·ished, ad·mon·ish·ing, ad·mon·ish·es

1. To reprove gently but earnestly.

2. To counsel (another) against something to be avoided; caution.

3. To remind of something forgotten or disregarded, as an obligation or a responsibility.

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[Middle English amonishen, admonishen, alteration of amonesten, from Old French amonester, admonester, from Vulgar Latin *admonestre, from Latin admonre : ad-, ad- + monre, to warn; see men-¹ in Indo-European roots.]

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ad·monish·er n.

ad·monish·ing·ly adv.

ad·monish·ment n.

Synonyms: admonish, reprove, rebuke, reprimand, reproach
These verbs mean to correct or caution critically. Admonish implies the giving of advice or a warning in order to rectify or avoid something: "A gallows erected on an eminence admonished the offenders of the fate that awaited them" (William Hickling Prescott).
Reprove usually suggests gentle criticism and constructive intent: With a quick look, the teacher reproved the child for whispering in class.
Rebuke and reprimand both refer to sharp, often angry criticism: "Some of the most heated criticism . . . has come from the Justice Department, which rarely rebukes other agencies in public" (Howard Kurtz). "A committee at [the university] asked its president to reprimand a scientist who tested gene-altered bacteria on trees" (New York Times).
Reproach usually refers to regretful or unhappy criticism arising from a sense of disappointment: "Every other author may aspire to praise; the lexicographer can only hope to escape reproach" (Samuel Johnson).

Thesaurus

Noun

1.

admonisher - someone who gives a warning so that a mistake can be avoided monitor, reminder defender, guardian, protector, shielder - a person who cares for persons or property