Qenya
rinde
noun. circle
loa
noun. year
yén
noun. year
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 “circle” in The Etymologies of the 1930s under the root ᴹ√RIN (Ety/RIN).
Conceptual Development: The Qenya Lexicon of the 1910s had ᴱQ. rinko “disc, circle, orb” under the early root ᴱ√RINI (QL/80). The contemporaneous Poetic and Mythological Words of Eldarissa had rinko “disc” (PME/80).
Neo-Quenya: For purposes of Neo-Quenya, I would use rindë for “circle” but [ᴺQ.] rinco for “disc”.