RUKU

RUKU (or RUK) is an Elvish root signifying "the dreadful shapes ... taken by the servants of Melkor" that haunted the Elves and "the terror that they inspired".

Derivatives
Other versions

In the Etymologies appears the root RUK, signifying "demon".

Also in the Etymologies appears the root ÓROK, from which derive words signifying "goblin":

Referencias

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