A root in The Etymologies of the 1930s glossed “day” with various derivatives like ᴹQ. are, N. aur “day” and ᴹQ. arin “morning” (Ety/AR¹). In Tolkien’s later writings, the Quenya word for “day” became aurë (RC/727; S/190), and in 1957 Quenya Notes he devised a new etymology for these day-words from the root √UR “heat” as in ✶auri “heat, period of sun” (PE17/148). That opens the question whether the various 1930s Quenya “morning” words from ᴹ√AR remain valid, but many Neo-Quenya writers (including me) retain them since there aren’t really any good alternatives. They might be salvageable as derivatives of the later root √AS “warmth” (so that “day” = “hot” and “morning” = “warm”).
Middle Primitive Elvish
danta-
verb. fall
(n)dan
root. back, backwards
lilt
root. dance
ar
root. day
ari
noun. day
(g)lingi
root. hang
A root in The Etymologies of the 1930s glossed “hang” and acting as an alternate explanation of ᴹQ. Laurelin, usually interpreted as “Song of Gold” but also meaning “Hanging Flame” as reflected in its Noldorin name Glingal (Ety/GLING, LIN², LING). The continued appearance of S. Glingal in later versions of The Silmarillion indicates this root likely remained valid (S/126).
A pair of forms ᴱQ. kinka- “to hang (intr.)” and ᴱQ. kinkata- “hang (tr.)” in the Qenya Lexicon of the 1910s imply the existence of a root ᴱ√KINIKI, which may be a precursor to ᴹ√(G)LINGI.
(n)dak
root. slay
dat
root. fall down
da(n)t
root. fall down
dak
root. slay
lingi
root. hang
tanka
adjective. firm
A root in The Etymologies of the 1930s glossed “dance” with derivative ᴹQ. lilta- of the same meaning (Ety/LILT). It is a later iteration of ᴱ√LḶTḶ “dance” from the Qenya Lexicon of the 1910s, with both Qenya and Gnomish derivatives like ᴱQ. lilt and G. lalt “dance” (QL/55; GL/52).