Early Quenya
yáme
adjective. yawning
mandu yáme
the abyss yawning
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.
The twenty sixth line of the Oilima Markirya poem (MC/214). The first word is the noun mandu “abyss” (usually translated “hell”) followed by the adjective yáme “yawning”.
Decomposition: Broken into its constituent elements, this phrase would be:
> mandu yáme = “✱abyss yawning”