Early Quenya
móri
noun. night
morion
masculine name. Son of the Dark
móre
noun/adjective. night, darkness; black, dark
fui
noun. night
morna
adjective. black
morqa
adjective. black
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.