Did you have any specific Numenorean "magic" in mind? I'm not thinking of what that would be.
Generally, tho, I would say that in Tolkien's world, most things "called" magic are generally just the results of an art (or what we might call technology) which other peoples lack and don't understand.
Thus, for example, the Palatiri were no more "magic" than, say, a cell phone. Both allow communication over long distance with no visible means of words or thought passing. The difference is that we (21'st century mankind) understand how a cell phone works but we (and the 3rd age men) don't understand how the Palantiri work. Of course, Palantiri were made by elves, not Numenoreans.
Dwarven "magic" may have been similar. They understood stone well enough to have developed a way (which men never learned or understood) of making doors unseeable. Similarly, "Moon Letters" sound like just another kind of invisible writing (like kids writing in lemon juice which is unreadable until heated). Granted "WE" don't know how to make letters that are only visible in moonlight, but that doesn't mean such a discovery couldn't be made.
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