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.
ilwe
noun. sky, heavens
ilu
noun. ether
taime
noun. sky
A word for “the sky” in the Qenya Lexicon of the 1910s, with variants Taime and Taimie from the early root ᴱ√TAHA [DAHA] (QL/87). ᴱQ. tea “sky” from Early Qenya Word-lists of the 1920s is probably related, as suggested by Patrick Wynne and Christopher Gilson (PE16/142).
taimie
noun. sky
tea
noun. sky
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 in the Qenya Lexicon of the 1910s described as “sky, heavens, the blue air that is about the stars, the middle layers”, derived from the root ᴱ√ILU “ether, the slender airs among the stars” (QL/42). Hence it was above the lower airs (where people breathed) and below the upper airs (outer space); this arrangement of lower, middle, upper airs is one that Tolkien eventually abandoned in his later writings.