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.
istil
noun. silver light, starlight
istil
noun. Moon
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 Doriathrin noun for “silver light, starlight”, also given as istel, which developed from the root ᴹ√SIL (Ety/SIL). Tolkien said that it was probably originally a (ancient?) Quenya word learned from Melian. This apparently this means its development was unusual. Along with the identical Istil “Moon”, it is the only Ilkorin noun with a medial [st]. Helge Fauskanger suggested it must have developed by a strengthening of [s] to [st]. It may also be another example of a development from syllabic [ṣ], though elsewhere [[ilk|initial [s] became [es] before voiceless stops]].