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.
dai
noun/adjective. sky; high
dâ
adjective. high
A word glossed “high” in Early Noldorin word lists of the 1920s derived from ᴱ✶dagá (PE13/141, 161). The Gnomish Lexicon of the 1910s also had G. dâ “high” (GL/29), while the Gnomish Lexicon Slips modifying that document had G. da “high” also derived from ᴱ✶dagá (PE13/112). In Tolkien’s later writings, the root became √TĀ/TAƷ, so these d-forms would have been abandoned.
telum
noun. sky, sky; [G.] roof
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 for “the sky” appearing in the Gnomish Lexicon of the 1910s (GL/29), likely derived from the root ᴱ√TAHA [DAHA] as suggested to Christopher Tolkien (LT1A/Telimektar; QL/87). ᴱN. dai “sky” appeared again in Early Noldorin Word-lists of the 1920s (PE13/141), but in marginal notes to the Lays of Beleriand of the 1920s it was glossed “high” (LB/49 note on line #946). Its most notable use was in the name Dor-na-Dhaideloth “[Land of] the Heaven Roof” (LT2/287), but in later writings this name became Dor Daedeloth, with an initial element of N. dae “shadow” >> S. daer “great”.