A root in The Etymologies of the 1930s glossed “void”, with derivatives like ᴹQ. kúma “void” and N. caun “empty” (Ety/KUM). It was probably also the basis of ᴹQ. kumba in ᴹQ. saurikumba in Lord of the Rings drafts from the 1940s, unglossed but probably “✱foul-bellied” (SD/86).
Middle Primitive Elvish
gaw
root. think out, devise, contrive
ñgaw
root. howl
gāsa
noun. void
kum
root. void
A root in The Etymologies of the 1930s glossed “think out, devise, contrive”, appearing beside a variant ᴹ√GOWO (Ety/GAWA). Its most notable derivative is the name Q. Aulë, which Tolkien usually translated as “Maker” (S/44) or “Smith” (LotR/1137). Its Noldorin counterpart in the 1930s was N. Gaul, replacing G. Ôla from the 1910s, but Tolkien did not give a Sindarin equivalent of Aulë’s name in his later writings. In 1959-60 Tolkien portrayed Q. Aulë as an adaptation of this Valarin name Aʒūlēz, but I would retain ᴹ√GAW for purposes of Neo-Eldarin.