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.
deldron
noun. beech (tree)
deldron grondolas
noun. oakleaved beech
deldrin grontholas
noun. oakleaved beech
gronthos deldrinwed
noun. oakleaved beech
A word in the Gnomish Lexicon of the 1910s appearing as G. {grondos deldrinwed >>} gronthos deldrinwed “oakleaved beech”, a combination of G. {grondos >>} gronthos “oaktree” and G. deldrinwed “beechen” (GL/30, 42).
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 an “oakleaved beech” in the Gnomish Lexicon of the 1910s, a combination of G. deldron “beech” and grondolas “oakleaved” (GL/30, 42). On the page containing deldron Tolkien mispelled “beech” as “beach” (GL/30), while on the page containing grondolas he spelled the compound as deldrin grontholas (GL/42).