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

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

ilon

masculine name. Ilúvatar, God

Gnomish [GL/50; LT1A/Ilwë; LT2A/Teld Quing Ilon; PE15/27] Group: Eldamo. Published by

ilathon

masculine name. Lord for Always

Gnomish [GL/50; LT1A/Ilwë; LT2A/Ilúvatar; PE13/103; PE15/20; PE15/23; PE15/27] Group: Eldamo. Published by

thlim quing ilon

collective name. *Folk of the Heavenly Arc

Name for the people of Egalmoth in an early name list (PE13/104), a combination of thlim “race”, cwing “bow” [arc] and ilon “sky”, with quing ilon “sky bow” = “rainbow” as in Cris a Teld Quing Ilon “Gully of the Rainbow Roof”. Egalmoth’s people were called the “they of the Heavenly Arc” on LT2/173.

cris a teld quing ilon

place name. Gully of the Rainbow Roof

Gnomish [LT2/202; LT2A/Teld Quing Ilon; LT2I/Teld Quing Ilon; PE13/101; PE15/21] Group: Eldamo. Published by

cris ilbranteloth

place name. Gully of the Rainbow Roof

Gnomish [GL/50; LT2/150; LT2/202; LT2A/Cris Ilbranteloth; LT2A/Teld Quing Ilon; LT2I/Cris Ilbranteloth; LT2I/Ilbranteloth; LT2I/Teld Quing Ilon; PE15/21; SMI/Cris Ilbranteloth] 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).

dai

noun. sky

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

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.