I'm afraid that what you're asking, here and in the parallel post, is for something that hasn't yet been written: a comparative philology of BoLT-era Gnomish and Qenya relative to post-LR Sindarin and Quenya. One would really have to have available a full set of linguistic "laws" covering the evolution of the Elvish tongues in Tolkien's mind over some six decades.
This much at least we do know: nearly all of the names and words in BoLT are Qenya except for those (relatively) few which are explicitly Gnomish, as in the Fall of Gondolin.
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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