A (Ilkorin-only?) root in The Etymologies of the 1930s with the derivatives Ilk. esg “sedge, reed”, Ilk. esgar “reed-bed”, and Ilk. Esgaroth “reed-lake” (Ety/ESEK). Elsewhere it seems S. lisg means “reed” as in S. Lisgardh “Land of Reeds” (UT/34), and similarly ᴹQ. liske < ᴹ✶lisge (PE19/51). Thus I suspect ᴹ√ESEK was a transient idea, one of the etymologies Tolkien considered for Esgaroth.
Middle Primitive Elvish
reg
root. edge, border, margin
rē-
?. female
lisge
noun. reed
us(u)kwē
noun. reek
esek
root. *sedge, reed
liski
root. ?reed
usuk
root. *reek, smoke; dusk
ar
root. day
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”).
ari
noun. day
nī/ini
root. female
ñol-
noun. smell
A root in The Etymologies of the 1930s glossed “edge, border, margin” with derivatives like ᴹQ. réna of similar meaning and N. rhain “border” (Ety/REG). ᴹ√REG replaced a rejected variant ᴹ√RAG (EtyAC/REG). The root is evident in only one name: N. {Duil Rain >>} Emyn Rhain “Border Hills” in Lord of the Rings drafts from the 1940s (TI/268, 313), called S. Emyn Muil “Drear Hills” in the published version of The Lord of the Rings (LotR/373; RC/334).