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.
nîn Archaic
noun. pool
nîn
noun. tear
asc
noun. water
A noun glossed “water” appearing in the Official Name List for the Lost Tales of the 1910s, probably based on the early root ᴱ√ASAKA which was used for words meaning “waterfall” (PE13/101).
duif
noun. stream
eilin
noun. pool
nien(n)
noun. tear
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.
An archaic noun in the Gnomish Lexicon of the 1910s glossed “pool” (GL/60), almost certainly derived from the early root ᴱ√NENE (QL/65).