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.
rue
noun. rest, stillness, remaining, steadfastness
kaitoile
noun. rest
A noun appearing as kaitȯile “rest” in the Qenya Lexicon of the 1910s, apparently derived from (deleted) ᴱQ. kaito- “lie quiet” (QL/46). The significance of the marked ȯ is not clear.
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 appearing as ᴱQ. rue “rest, stillness, remaining, steadfastness” in the Qenya Lexicon of the 1910s under the early root ᴱ√RU’U, the noun form of ᴱQ. rua “steady, still, tranquil” (QL/80).
Neo-Quenya: For purposes of Neo-Quenya, I would retain ᴺQ. ruë derived from a Neo-Root ᴺ√RUH, but with a slightly revised meaning “stillness, ✱steadiness, tranquility” to be more compatible with its adjective.