An adverbial form of anda “long” from the phrase Q. Eldar ando kakainen loralyar Koivienenissen “the Elves were long lying asleep at Koivienéni” (VT27/7).
Qenya
sûr
masculine name. Sûr
anda
adjective. long
ando
adverb. long
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.
Earliest Quenya name of Sauron (LR/15).