Early Noldorin
faus
noun. thirst
fauglith
place name. Thirst
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.
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 word appearing as ᴱN. faus “thirst” in Early Noldorin Wordlists of the 1920s, a noun form of better known faug “thirsty”.
Conceptual Development: In the Gnomish Lexicon of the 1910s Tolkien had G. luist “thirst” and variant luibri (GL/55) clearly from the early root ᴱ√LOYO (QL/56). He also had G. maig “thirst” with longer variant maiglos (GL/56), the latter appearing in ᴱN. Dor-na-Maiglos (LB/49), the earliest name for S. Dor-nu-Fauglith.
Neo-Sindarin: For purposes of Neo-Sindarin, I would adapt the Early Noldorin form as ᴺS. faus(t); compare to [N.] haust “bed” (Ety/KHAW).