Early Quenya
tauno
noun. (great) forest
málos
noun. forest
taure
noun. forest
taurie
noun. forest
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 noun in the Gnomish Lexicon of the 1910s given as the cognate of G. goloth “forest”, derived from primitive ᴱ✶ŋgua-aloþ- (GL/41). This is likely a combination of ᴱ✶ŋu̯a “together” and some elaboration of the root ᴱ√ALA “spread”, the basis of “tree” words, so probably originally “✱together spread(ing)” or something to that effect.