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.
gwent
noun. brook, small river
gwent
adjective. big, large; fine
gwen(n)
adjective. big, large; fine
The Gnomish Lexicon of the 1910s had G. gwen “large, big; fine” under an early root ᴱ√gwene-, while on another page it had variants gwent, gwenn “big, large; fine” (GL/45).
nern
noun. brook
A noun glossed “brook” in the Gnomish Lexicon of the 1910s, a derivative of ᴱ√nere (GL/60).
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 noun in the Gnomish Lexicon of the 1910s given as G. gwent “brook, small river” with an apparent variant gwed, both derivatives ᴱ√gu̯et (GL/46).