Another name for a Silmaril appearing in The Etymologies from the 1930s, a compound of Noldo and míre “jewel” (Ety/ÑGOLOD).
Qenya
ilumíre
proper name. Silmaril
noldomír(e)
proper name. Silmaril
silmaril
proper name. Silmaril
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.
Another name for a Silmaril appearing in The Etymologies from the 1930s (Ety/IL), apparently a compound of ilu “world” and míre “jewel”.