Qenya
oi
adverb. ever
oi-
verb. to live, pass one’s days
oio
noun. bird
miue
noun. cat
ia
adverb. ever
pelko
noun. leg
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 for “cat” in the Declension of Nouns from the early 1930s, from primitive {mauı̯ǝ >>} miuı̯ǝ (PE21/12-13), and so probably related to the root ᴹ√MIW “whine” from The Etymologies which had the derivative ᴹQ. miule “whining, mewing” (Ety/MIW). The stem form of this “cat” word is the rather unusual miuy-.
Conceptual Development: In the Qenya Lexicon and Poetic and Mythological Words of Eldarissa of the 1910s, the word for “cat” was ᴱQ. meoi (QL/61; PME/61), as in ᴱQ. Vardo Meoita “Prince of Cats” (LT2/15), a sobriquet of ᴱQ. Tevildo. In Early Qenya Word-lists of the 1920s, Tolkien instead gave ᴱQ. yaule “cat”, probably an onomatopoeic word as suggested by Patrick Wynne and Christopher Gilson (PE16/132).
Neo-Quenya: In PPQ (PPQ) from the early 2000s, Terry Dock suggested the neuter, feminine and masculine neologisms for “cat”: ᴺQ. miura, ᴺQ. miurë, and ᴺQ. miuro. However, this predates the publication of ᴹQ. miue “cat”, and I would recommend just sticking with the attested form.