Early Quenya
paltyalda
noun. palm tree
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.
Quenya
paltalda
noun. palm tree
A word appearing as ᴱQ. paltyalda “palm tree” in the Poetic and Mythological Words of Eldarissa of the 1910s, a combination of ᴱQ. paltya “flat of hand, palm of hand” and ᴱQ. alda “tree” (PME/74).
Neo-Quenya: Since palta is “flat of the hand, ✱palm” in Tolkien’s later writings, I would update this word to ᴺQ. paltalda “palm tree”.