Qenya
hen
noun. eye
yé
noun. eye
si
pronoun. this
oio
noun. bird
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.
The word ᴱQ. sé “eye, pupil” appeared in the Qenya Phonology of the 1910s derived from ᴱ✶þeχē (PE12/21), and ᴱQ. sē reappeared with the gloss “eye, eyeball” in the contemporaneous Qenya Lexicon under the early root ᴱ√SEHE [ÞEHE] (QL/82). A similar word ᴹQ. yé “eye” appeared in the Declension of Nouns from the early 1930s (PE21/40). Both were likely displaced by Q. hen “eye” < √KHEN.