Qenya
nis
noun. woman (of any kindred: elf, human or dwarf)
nis
noun. minnow, ‘little fish’
ni
pronoun. I, me
nisse
noun. woman
nikse
noun. minnow, little fish
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 in the Declension of Noun from the early 1930s as nis (niks-) or nikse “minnow, little fish” (PE21/20, 27). It reappeared in the Quenya Verbal System from the 1940s in the phrase ᴹQ. niksi koitar nenesse “fish live in water” (PE22/125). It might be related to the root √NIK “small”.