Dream

Anatoly Liberman posted this very interesting article on the etymology of the English word dream, and it got me thinking whether Tolkien was aware of the ambiguity behind the etymology (in Old English, the word seems more associated with "joy, noise, life" than "dream", it's worth reading the entire two-part article) and made the roots OLOS and GALAS similar on purpose. I am probably seeing stuff into things here, but I wouldn't put anything past Tolkien :)

Sindarin Phonetic Development (Part 107)

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S. short vowels generally lengthened in monosyllables; [C*V̆C] > [C*V̄C]

NOTE: The examples in this entry were fairly comprehensive when it was written (April 2019) but new examples may have been published since then. For brevity, this entry does not provide references for every word, but it does link each to the appropriate word in Eldamo.

Sindarin Phonetic Development (Part 106)

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S. final [w] usually became [u]; [-C{vw}|-aw] > [-Cu|-au]

In both Sindarin and Noldorin, where it was not otherwise lost, a final [w] usually became [u], mostly notably after a consonant as described by David Salo (GS/§4.195). In Tolkien’s writing, he sometimes represented this final [u] as -w, but this seems to be an orthographic convention, not the actual pronunciation. He mentioned this sound change a number of times: