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.

Doriathrin

neldor

noun. beech

A Doriathrin noun for “beech (tree)”, properly referring to Hirilorn with a true meaning of “three trunks” (Ety/NEL). Tolkien indicated it was a combination of neld “three” and orn “tree”, though it is unclear why the final -n vanished. He marked this derivation with a “?” perhaps because of this uncertainty.

Conceptual Development: Tolkien seems to have coined this word to explain names like Neldoreth. Its most obvious precursor is ᴱQ. neldor (QL/65).

Doriathrin [Ety/BERÉTH; Ety/NEL] Group: Eldamo. Published by

galbreth

noun. beech

A Doriathrin (and Falathrin) noun for “beech (tree)”, a combination of gald “tree” and breth “(beech) mast” (Ety/GALAD, BERÉTH). The second element originally meant “beech”, but later meant “mast”; this original meaning seems to be preserved in this compound.

Doriathrin [Ety/BERÉTH; Ety/GALAD; Ety/NEL] Group: Eldamo. Published by

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.