There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
gaw
root. think out, devise, contrive
ñgaw
root. howl
gāsa
noun. void
kum
root. void
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).
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
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.