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.

Gnomish

climli

noun. heaven, sky

A noun in the Gnomish Lexicon of the 1910s glossed “heaven, sky”, derived from the root ᴱ√tel- (GL/26). It is likely related to ᴱQ. telimbo “canopy, often used = sky” (QL/90), where the initial tel- became tl- and then tl- became cl-.

dai

noun. sky

Gnomish [GL/29; LT1A/Telimektar; PE13/112] Group: Eldamo. Published by

ilon

noun. sky

A word for “sky” in an early name list from the 1910s and appearing in a couple early names: G. Thlim Quing Ilon “✱Folk of the Heavenly Arc” and G. Cris o Teld Quing Ilon “Gully of the Rainbow Roof” (PE13/101, 104), the latter revised to G. Cris Ilbranteloth (LT2/202). In the contemporaneous Gnomish Lexicon, however, G. Ilon was the name of Ilúvatar (GL/50).

Gnomish [LT2A/Teld Quing Ilon; PE13/104; PE15/27] Group: Eldamo. Published by

luithon

noun. sky

A word for “sky” in the Gnomish Lexicon of the 1910s, an elaboration of G. lui “blueness” (GL/55).

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.