An unglossed root in The Etymologies of the 1930s with derivatives like ᴹQ. yat/N. iaeth “neck” (Ety/YAK). It might also be the basis for later Sindarin S. iach “ford” as in S. Arossiach “Ford(s) of Aros” (S/121, WJ/338).
Middle Primitive Elvish
ya
root. there, over there; (of time) back, ago
yag
root. yawn, gape
yatmā
noun. yatmā
yab
root. fruit
yak
root. *neck
yal
root. to cry, cry, *call
A root in The Etymologies of the 1930s glossed “to cry” with variants ᴹ√YAM and ᴹ√YAL with derivatives like N. ialla- “to call” (EtyAC/YAL). It is likely a later iteration of unglossed ᴱ√Y̯AMA from the Qenya Lexicon of the 1910s with derivatives like ᴱQ. yāma/G. gam “shout” and ᴱQ. yama-/G. gama- “shout, call” (QL/105; GL/37). It seems that ᴹ√YAM was unused in the 1930s and thereafter, but ᴹ√YAL is probably the basis for Q. yal- “summon” and its elaborations like Q. enyalië “memory, recalling” (UT/317).
yay
root. mock
A root in The Etymologies of the 1930s glossed “mock” with derivatives like ᴹQ. yaiwe/N. iaew “mocking, scorn” (Ety/YAY). Primitive ᴱ✶peia “scorn” from Early Noldorin Word-lists of the 1920s is a possible precursor; its primitive form is very different, but its Early Noldorin derivative ᴱN. hai is not that dissimilar (PE13/146).
yagwē
noun. ravine, cleft, gulf
yagō
noun. gulf
yakta-
noun. neck
yantā
noun. yoke
yar
root. blood
yat
root. join
yatta
preposition. across
-yā
suffix. causatives from verbs
yam
root. to cry, cry, [ᴱ√] *call, shout
yan
root. *holy
yat
adverb. away, back there; ago
(a)yan
root. *holy
yan
root. give
A root in The Etymologies of the 1930s glossed “give” with derivatives ON. yanta- “give” and ᴹQ. Ariante “Day-bringer” (EtyAC/YAN²). Tolkien marked this entry with a “?”, and elsewhere in The Etymologies he derived ᴹQ. anta-/N. anna- “give” from ᴹ√ANA (Ety/ANA¹), so I suspect this root was a transient idea.
gas
root. yawn, gape
A root in The Etymologies of the 1930s glossed “yawn, gape” with several derivatives such as ᴹQ. assa/N. gas “hole” and N. gaw “void” (Ety/GAS). The names based on this root like N. Belegast and ᴹQ. Ilmen-assa do not appear in later versions of the Legendarium, so the eventual fate of this root is uncertain, especially given that there are other roots of similar meaning like ᴹ√YAG “yawn, gape” (Ety/YAG) that do reappear later (Let/383; PE17/35, 42).
Neo-Eldarin: For purposes of Neo-Eldarin, derivatives of this root are among the best attested words for “hole”, so it’s probably best to retain ᴹ√GAS and its derivatives in Neo-Eldarin writing.
anga
root. iron
daʒ
root. great
ringi
root. cold
wān
noun. goose
yen
root. daughter
yāba
noun. fruit
patnā
adjective. wide
hō
noun. shout
khelek
root. ice
nyol
root. ring
ta
root. that
ungwē
noun. gloom
uñg
root. *gloom
vaianer
noun. sailor
yel
root. daughter
yend
noun. daughter
yābā-sūka
noun. fruit drink, cider
yē
preposition. at
The first appearance of this root was as unglossed ᴱ√Ẏ̯AVA in the Qenya Lexicon of the 1910s with a Gnomish form gav- and derivatives like ᴱQ. yausta “crop” and ᴱQ. yáva “fruit, produce” (QL/105). The Gnomish form appeared as the verb G. gav- “produce, yield, bear fruit” in the contemporaneous Gnomish Lexicon along with other derivatives like G. gaust “corn, crop (espec. of cereal)” and G. gôf “fruit” (GL/38). In the Gnomish Lexicon Tolkien specified the primitive form as √ı̯aƀa and said “note not gı̯aƀ, for cp. Ivon < ı̯ǝƀánna, Q Yavanna” (GL/38).
The root appeared as ᴹ√YAB “fruit” in The Etymologies of the 1930s with derivatives like ᴹQ. yáve “fruit” and N. iau “corn” (Ety/YAB). Tolkien’s continued use of Q. yávë for “fruit” (VT43/31) and the names Q. Yavanna/S. Ivann “Fruit-giver” (S/27; LotR/1110) indicate the ongoing validity of this root.