Name for the region of Air in Silmarillion notes from the 1930s (SM/236). It is simply vista “air as substance” used as a name.
Qenya
wilma
noun. inner or lower air
qilir
noun. quiet
vista
place name. Air
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.
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.
The noun ᴱQ. qilde or qille “quiet, rest, hush” appeared in the Qenya Lexicon of the 1910s under the early root ᴱ√QḶÐḶ (QL/44). Qilde also appeared in the contemporaneous Gnomish Lexicon as equivalent to (deleted) G. clidhron (GL/23). The Declension of Nouns from the early 1930s instead had noun ᴹQ. qilir “quiet” derived from primitive ᴹ✶ku̯ilẹz (PE21/33-34), based on a similar root.
Neo-Quenya: For purposes of Neo-Quenya, I prefer ᴺQ. quildë “quiet, rest, hush” as most compatible with its adjective form ᴺQ. quilda “quiet, hushed, still” and the later Quenya syncope.