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.
cwileg
noun. alder
polonde
noun. alder
A word for “alder” [a type of birch tree] in Early Qenya Word-lists of the 1920s of unclear derivation (PE16/140).
Conceptual Development: The Qenya Lexicon of the 1910s had ᴱQ. ulwe or uluswe “alder tree”, also of unclear derivation (QL/97). The English-Qenya Dictionary of the 1920s had ulwe or ululwe “alder, alder-tree”, but this entry was deleted (PE15/69).
Neo-Quenya: Since it does not conflict with any later words, I would retain ᴺQ. polondë “alder” for purposes of Neo-Quenya.
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.
polondë
noun. alder
A word for “alder” [a type of birch tree] in the Gnomish Lexicon of the 1910s, apparently based on G. cwîl “quiet” (GL/28).