Learn English – Word for “someone who warns”

single-word-requests

I'm trying to write out an document of sorts though I need the word for "someone who warns". I've done a bit of searching but couldn't find anything.

I initially thought it was "warner" though it doesn't show up in the English dictionary and doesn't exactly sound right.

So I ask, what is the correct word if there even is one. If there isn't a correct word, what would be best to use as surely, "someone who warns" can't be?

Best Answer

Monitor

 1. One who admonishes; one who warns of faults, informs of
    duty, or gives advice and instruction by way of reproof or
    caution.
    [1913 Webster]

 2. Hence, specifically, a pupil selected to look to the
    school in the absence of the instructor, to notice the
    absence or faults of the scholars, or to instruct a
    division or class.
    [1913 Webster]

 3. someone who gives a warning so that a mistake can be avoided
    [Collaborative International Dictionary of English]

Somebody has to warn kids not to steal the milk.

It has the same root as admonish but describes the person and their authority.

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