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.
fuin
adjective. secret, dark; hoarded
fuin
adverb. worse
fui
noun. night
fien
adverb. worse
taurfuin
place name. Forest of Night
cwist
noun. secret
fegla
adjective. worse
feigien
adjective. worse
fuior
noun. deadly nightshade
morth
noun. darkness
mugwen
adjective. secret
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.
See later S. Taur-nu-Fuin for general discussion. @@@