Qenya
estanosse
collective name. Firstborn
esta
adjective. first
enna
adjective. first
inga
adjective. first
minya
ordinal. first
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.
A rejected term for the Elves as Firstborn of Iluvator (EtyAC/SET), a combination of (rejected) esta “first” and nosse “clan”.