A Noldorin name the Moon glossed “Sky-hunter” appearing in The Etymologies from the 1930s, a combination of ell “sky” and faron “hunter” (Ety/SPAR, EtyAC/SPAR).
Noldorin
ell
noun. sky
elfaron
proper name. Sky-hunter
elthoron
masculine name. Eagle of the Sky
gwilith
noun. air (as a region), air (as a region), *lower sky; [G.] breeze
An abstract noun in The Etymologies of the 1930s glossed “air as a region” under the root ᴹ√WIL (Ety/WIL). In other words, you breath N. gwelw (ᴺS. gwelu) “air as a substance”, but birds fly through gwilith, basically making it the lower sky below the clouds.
Conceptual Development: In Gnomish Lexicon of the 1910s, G. gwilith was “a breeze” (GL/45).
eilian(w)
noun. rainbow, (lit.) sky-bridge
elianw
noun. rainbow, (lit.) sky-bridge
elrond
masculine name. Starry-dome, Sky
el
noun. star
alagon
noun. storm
alagos
noun. storm of wind
daedelu
noun. canopy
daedelu
noun. canopy
A word for a “canopy” in The Etymologies of the 1930s, a combination of N. dae “shadow” and N. telu “roof” (Ety/TEL; EtyAC/DAY).
Neo-Sindarin: Since Tolkien seems to have later abandoned the meaning “shadow” for N. dae, I would not use this word for “canopy” in Neo-Sindarin, and would use other words like esgal or [N.] orthelian instead.
eilian
noun. rainbow
eilianw
noun. rainbow
elw
adjective. (pale) blue
faun
noun. cloud
faun
noun. cloud
geil
noun. star, bright spark
geil
noun. star
giliath
noun. all the host of stars
gwelw
noun. air (as substance)
gwelwen
noun. air, lower air (distinct from the upper air of the stars, or the outer)
gwilith
noun. air (as a region)
lhind
noun. air, tune
lhinn
noun. air, tune
lhûn
adjective. (unknown meaning)
This word, which also appears on the map of Middle-earth in LotR, is glossed as "blue" in The Etymologies, but Tolkien later rejected this meaning (as luin was already used in that sense). He then proposed several explanations for it, including the possible adaptation of a Dwarvish name into Sindarin, but he apparently never reached a definitive solution.
lhûn
adjective. blue
orthel-
verb. to roof, screen above
orthelian
noun. canopy
orthelian
noun. canopy
A word for “canopy” in The Etymologies of the 1930s, a noun form of N. ortheli “roof, screen above” (Ety/TEL).
telu
noun. dome, high roof
ui
noun. envelope (especially of the Outer Sea or Air enfolding the world within the Ilurambar or world-walls)
ui
noun. envelope
A noun appearing as N. ui “envelope” in The Etymologies of the 1930s derived from ON. uia < wōia [wǭia] < ᴹ✶wāyā under the root ᴹ√WAY of similar meaning (Ety/WAY). It was used “especially of the Outer Sea or Air enfolding the world within the Ilurambar or world-walls”. In Noldorin of the 1930s, it seems the normal development of ancient āy was ui, with the initial w vanishing before u: wāyā > wǭia > uia > ui.
Neo-Sindarin: In Sindarin of the 1950s and 60s it seems ancient āy became oe, as with goe < ✶gāyā (PM/363). As such the initial w- from ✶wāya would survive to become gw-. Indeed, Tolkien had ancient ✱wāya become gwoe in notes from around 1957 attempting to derive an etymology for gwae “wind” (PE17/34). As such, I would adapt this Noldorin word as ᴺS. gwoe “envelope” for purposes of Neo-Sindarin. I would use it in the more general sense of “a thing enveloping something else”, and not just limited to envelopes used for letters.
An element meaning “sky” in several names from The Etymologies of the 1930s: N. Elfaron “Sky-hunter” (Ety/SPAR) and N. Elthoron “Eagle of the Sky” (Ety/THOR). It was derived from the root ᴹ√ƷEL “sky” which had an Old Noldorin form: ON. elle (Ety/ƷEL). However, Tolkien said “In Noldorin and Telerin this is confused with EL star”, implying that the word was not used in modern language; an earlier but rejected version of this entry had archaic N. †ell, el “sky” (EtyAC/ƷEL).
Neo-Sindarin: Despite the above statements, ell is probably the best attested option for “sky” in Neo-Sindarin, and I would use it as such, since it is in fact distinct from S. êl “star”, a word that is itself archaic/poetic versus more common S. gil.