Early Quenya
tamuril
noun. yew
tamarin
noun. yew
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 as ᴱQ. tamuril “yew” in the Qenya Lexicon of the 1910s, but in the contemporaneous Poetic and Mythological Words of Eldarissa it was tamarin “yew” (QL/84; PME/84). The etymological basis for either word is unclear.
Neo-Quenya: I would retain ᴺQ. tamuril “yew” for purposes of Neo-Quenya, since there are no later alteratives.