Early Quenya
qá
noun. duck
on(t)
noun. everything
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.
An (onomatopoeic?) noun appearing as ᴱQ. qā “a duck” in Qenya Lexicon of the 1910s derived from the early root ᴱ√QAHA (QL/76). It was also mentioned in the Poetic and Mythological Words of Eldarissa (PME/76). Later iterations of this onomatopoeia may be seen in primitive ✶kawāk “crow” (WJ/395) and ✶kāwāk “frog” (VT47/36), producing Q. quáco and Q. quácë respectively.
Neo-Quenya: I’d adapt this word as ᴺQ. quá “duck” for purposes of Neo-Quenya.