An unglossed root in the Outline of Phonology from the early 1950s illustrating certain phonetic combinations (PE19/98), and therefore possibly not a “real” root.
Primitive elvish
nes
root. feminity (apart from sex)
nes-
adjective. sweet smelling
nes
root. give to feed; feed, pasture; graze
neth
root. (young) woman, female person; sister; fresh, lively, merry, (young) woman, female person; sister; fresh, lively, merry; [ᴹ√] young
lemek
root. [unglossed]
phut
root. [unglossed]
An unglossed root appearing in the second version of Tengwesta Qenderinwa (TQ2) as an etymological variation of √PUT (PE18/90).
sal
root. [unglossed], *harp(ing), lyre
The unglossed root ᴱ√SALA appeared in the Qenya Lexicon of the 1910s with derivatives like ᴱQ. salma “lyre, small harp” and ᴱQ. salumbe “harping, music” (QL/81). The root √SAL appeared again Common Eldarin: Verb Structure from the early 1950s to illustrate the reformed perfect form of its verb Q. asálie (PE22/132), but since these later forms are unglossed it is unclear whether they have the same meaning (“✱harp(ing)”) as the earlier version of the root.
stuk
root. [unglossed]
tig
root. [unglossed]
A root appearing in Late Notes on Verb Structure (LVS) from 1969 as the basis for the verb Q. tinga- “go (for a long while)” (PE22/157). The etymology was marked with an “X” and so was probably a transient idea (PE22/157 note #70).
graw Reconstructed
root. [unglossed], [ᴹ√] dark, swart
This root appeared as a primitive form grawa serving as the basis of the word Q. roa “bear” >> “dog” in notes on monosyllabic roots from 1968 (VT47/35); a Sindarin derivative S. graw “bear” appeared in other notes written around the same time (VT47/12). Patrick Wynne suggested that in the sense “bear” grawa might be connected to the root ᴹ√GRAWA “dark, swart” from The Etymologies of the 1930s (EtyAC/GRAWA).
This root had a variety of meanings over Tolkien’s life. It first appeared as ᴹ√NETH “young” in The Etymologies of the 1930s with various Quenya and Noldorin derivatives of similar meaning, the most notable being the name ᴹQ. Nessa (Ety/NETH). In rough notes probably from around 1959, Tolkien redefined √NETH or √NES to mean “feminity apart from sex”, contrasted with √WEG or √WEƷ for masculinity, but he abandoned this line of reasoning deciding that √WĒ simply meant “person” independent of gender (PE17/189-190).
In notes on Eldarin Hands, Fingers and Numerals from the late 1960s, Tolkien again redefined √NETH, this time as the basis for Elvish “sister” words, either specifically meaning “sister” (VT47/12, 26, 34), meaning “(young) woman” (VT47/15, 32, 39) or perhaps “fresh, lively, merry” (VT47/32), the last of these probably a callback to its 1930s meaning “young”. In notes from 1959-60, however, the name Q. Nessa was disconnected from the root √NETH, derived instead from ✶Neresā meaning “she that has manlike valour or strength” (WJ/416).
Neo-Eldarin: For purposes of Neo-Eldarin, I think it is best for √NETH to retain its essential 1930s meaning “young, fresh, lively”, but with an association to young women as described in Tolkien’s notes from the 1960s, and thus by extension “sister” as named from the perspective of the parents.