A root in The Etymologies of the 1930s glossed “joy, be glad” that is an extension of ᴹ√GALA “thrive” (Ety/GALAS). Its two most notable derivatives were ᴹQ. alasse and N. glass “joy”. The appearance of Q. alassë “happiness” in the so-called “Merin Sentence” (MS), probably written after the publication of The Lord of the Rings, indicates that this root may have remained valid.
Middle Primitive Elvish
gal
root. shine
gal
root. grow, thrive
galad
root. tree
galas
root. joy, be glad
galan
root. bright
galadā
noun. tree
galyā
adjective. bright, light
galā-
verb. to grow
gālæ
noun. light
lop
root. horse, horse; [ᴱ√] *run (of animals), gallop, lope
This root was the basis for horse words starting with the Qenya Lexicon of the 1910s, where it appeared unglossed as ᴱ√LOPO (QL/56). It was compared to the root ᴱ√LOQO, and these roots include the verbs ᴱQ. lopo- “gallop, run (of animals)” and ᴱQ. loqo- “run (of human beings)”, so I think it is likely those were the meanings of the roots as well (QL/56). In the Qenya Lexicon, ᴱ√LOPO had the derivatives ᴱQ. lōpa “horse or mare” and ᴱQ. lopsi “mare” (QL/56), but elsewhere in that document there was the word ᴱQ. lapatte “rabbit” < ᴱ✶lopatte, so I think that word is related as well, though Tolkien did mark the primitive form with a “?” (QL/51). The probably-related word ᴹQ. lopo “rabbit” appeared in a discussion of nouns from the early 1930s (PE21/31).
In The Etymologies of the 1930s the root ᴹ√LOP was glossed “horse”, and its derivatives ᴹQ. olombo and N. lobor had only that sense (EtyAC/LOP), but horse words were usually derived from ᴹ√ROK from the 1930s and later. The word Q. lopoldi “rabbits” appeared in some 1965 notes on Númenor, so It seems likely √LOP remained valid in some form. Another possibly related late word is S. ✱laba- “hop” as in S. Labadal “Hopafoot” (UT/60).
Neo-Eldarin: For purposes of Neo-Eldarin, I think it is worth retaining ᴹ√LOP with a verbal sense “✱gallop, lope”. In this way, it can remain the basis for rabbit words based on their loping run. The horse words from this root might be specialized for heavier loping horses like destriers, since ᴹQ. rokko was said to refer more specifically to a “swift horse” (EtyAC/ROK).
glam
root. *noise, echo
A (Noldorin-only) root in The Etymologies of the 1930s, a strengthened form of the root ᴹ√LAM which was the basis of general sound words (Ety/GLAM). The derivatives of ᴹ√GLAM include N. glamm “shouting, confused noise” and N. glavra- “babble” but also N. glamor “echo” and N. glamren “echoing”, the last of these seen in N. Dorlamren, the pure Noldorin form of N. Dor-lómen “Land of Echoes”, which incorporates the Ilkorin word lómen “echoing” (LR/249; Ety/LAM).
The word S. glam “din, uproar, the confused yelling and bellowing of beasts” reappeared in the Quendi and Eldar essay written in 1959-60, where it was an element (as it was earlier) in the collective name for orcs: S. Glamhoth “Din-horde” (WJ/391). This strongly indicates that the “confused sounds” aspect of this root survived into Tolkien’s later conception of the language. However, the “echo” portion seemed to have been transferred to the unstrengthened form of this root √LAM as with (West) Sindarin loven “echoing” vs. North Sindarin lómin, which remained an element in Dor-lómin “Land of Echoes”, albeit reconceived of as a North Sindarin name (PE17/133).
ol
root. grow
glā
noun. radiance
bereth
root. beech
A root in The Etymologies of the 1930s serving principally as the basis for N. brethil “beech” (Ety/BERÉTH). In the notes from the late 1950s or early 1960s Tolkien instead connected brethil to the root √BARATH and S. bereth “queen”, where it had the true meaning of “princess” (PE17/23). But that could be a later association rather that a genuine etymology, and doesn’t necessarily invalidate ᴹ√BERETH (especially given the other phonological issues with S. bereth < √BARATH).
kal
root. shine
kalaryā
adjective. brilliant
anār
noun. Sun
golā-
verb. to grow
kalat
noun. light
k’lā
noun. light
lot(h)
root. flower
mori
adjective. black
narta
root. kindle
A root in The Etymologies of the 1930s glossed “kindle”, with derivatives ᴹQ. narta- and N. nartha- of the same meaning (EtyAC/NARTA). There is a mark above the final A that might be a partially formed macron (NARTĀ), so this “root” may just be an ordinary causative verb “✱make fire” = ᴹ√NAR + ᴹ✶-tā. The root was originally glossed “spear point, gore, triangle” with a derivative [N.] Narthas “gore”, a name that appeared in Lord of the Rings drafts but was eventually replaced by N./S. Naith “angle” (TI/244 note #50).
patnā
adjective. wide
pher(en)
root. beech
rauta
root. metal
A root in The Etymologies of the 1930s, first glossed “copper” and then “metal”, with derivatives ᴹQ. rauta/N. rhaud “metal” and serving mainly to explain names like N. Angrod and N. Finrod (Ety/RAUTĀ). It might have reappeared in the name S. Rodëol “metal of Eöl” from later Silmarillion drafts (WJ/322), but by 1957 Tolkien was explaining the final element of S. Finrod as S. raud “noble” (PE17/49, 118), so I think it is likely that ᴹ√RAUTA “metal” was abandoned.
Neo-Eldarin: For purposes of Neo-Eldarin, I’d use Q. tinco (LotR/1122) and its cognate [N.] tinc (Ety/TINKŌ) for “metal” words. For “copper” I'd use derivatives of √(U)RUS (VT41/10).
tinkō
root. metal
The “root” ᴹ√TINKŌ (more likely just a primitive word) appeared in The Etymologies of the 1930s with the gloss “metal” and derivatives like ᴹQ. tinko/N. tinc of the same meaning (Ety/TINKŌ). The reappearance of Q. tinco “metal” in The Lord of the Rings appendices (LotR/1122) strongly indicates its ongoing validity.
ᴹ√TINKŌ may have replaced the root ᴱ√SINI “pale blue” from the Qenya Lexicon of the 1910s with derivatives like ᴱQ. sink “mineral, gem, metal” and G. sinc “metal” (QL/83; GL/67); these early mineral words were originally attributed to ᴱ√SṆT͡YṆ “twinkle” before they were transferred to ᴱ√SINI, leaving only derivatives like ᴱQ. sintl “crystal” and ᴱQ. sinty- “sparkle” under ᴱ√SṆT͡YṆ (QL/85). However, in notes from the late 1960s Tolkien had primitive ✶sinki as an element ✶sinkitamo, the basis for Q. sintamo “smith” (PE17/108). Likewise there is evidence of the earlier root in Q. sinca “flint” as in Q. sincahonda “flint-hearted” (LotR/979), initially given as ᴹQ. tingahondo in Lord of the Rings drafts (SD/68).
Neo-Eldarin: For purposes of Neo-Eldarin, I would definitely use ✶tink- = “metal”, but I think it is worth keeping ✶sinki = “✱mineral = any inorganic solid including both stone and metal” as a variant.
yantā
noun. yoke
yur
root. run
A root in The Etymologies of the 1930s glossed “run” with derivatives like ON. yur- “run” and N. iôr “course” (Ety/YUR). It was a later iteration of ᴱ√ẎURU “run” from the Qenya Lexicon of the 1910s with derivatives like ᴱQ. yuro “a run, race” and ᴱQ. yuru- “run” (QL/106). For purposes of Neo-Eldarin, it is probably better to stick to the better attested root √NOR.
The basis for Elvish “tree” words, this root first appeared in The Etymologies of the 1930s as an extension of ᴹ√GALA “thrive” (Ety/GALAD). This replaced the earliest derivation of “tree” from the Qenya Lexicon of the 1910s, where the Qenya word for “tree” ᴱQ. alda was derived from ᴱ√ALA “spread” (QL/29). In The Etymologies, the Quenya form of this word remained the same, but the 1910s Gnomish words G. âl “wood” and †alwen “tree” (GL/19) became the 1930s Noldorin word N. galadh “tree” (Ety/GALA). Quenya and Sindarin retained these words for “tree” thereafter, and while Tolkien did not mention the root √GALAD again, his continued use of primitive ✶galadā “tree” (Let/426; PE17/153; PE21/74; UT/266) made it clear this root remained valid.