The noun is collective, a single flower being lotheg
Noldorin
ell
noun. sky
ellonel
feminine name. Ellonel
el
noun. star
edhel
noun. Elf
penedh
noun. Elf
penn
noun. Elf
eledhwen
feminine name. Elf-maid
geil
noun. star, bright spark
geil
noun. star
giliath
noun. all the host of stars
golodh
noun. "Deep Elf" or "Gnome", one of the Wise Folk
golodhrim
noun. Deep Elves, Gnomes
ial
noun. (?) a call, (?) a cry
ialla-
verb. to call
lhoth
noun. flower, inflorescence, a head of small flowers
lhothod
noun. (single) flower
lhothod
noun. single flower
loer
noun. summer
lothod
noun. (single) flower
nifredil
noun. a pale winter flower, snowdrop
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.