A root glossed “to flatten, lay low/flat, make flat what was standing” appearing in a list of roots from rejected page in the Quenya Verbal System of the 1940s, with variants and √G)RAD and √SRAD and no derivatives (PE22/127). It appears nowhere else.
Middle Primitive Elvish
mak
root. sword; fight (with a sword), cleave
makla
noun. sword
maktā-
verb. to fight
kar
root. make, build, construct
kar-
verb. make, do
tan
root. make, fashion
tultā-
verb. make come
dab
root. give way, make room, permit, allow
grad
root. to flatten, lay low/flat, make flat what was standing
aktō
noun. artificer, maker, wright
kat
root. shape, make
masag
root. knead, make soft by rubbing, kneading
ninkwitā-
verb. to make white (or pale), whiten
tak
root. fix, make fast, make
tankāta-
verb. to make firm
srad
root. to flatten, lay low/flat, make flat what was standing
tay
root. extend, make long(er), stretch
tek
root. write or draw (signs or letters), make a mark
maʒ
root. hand
etkat-
verb. to fashion
karan
root. red
This root appeared in The Etymologies of the 1930s glossed “red” (Ety/KARÁN), a later iteration of ᴱ√KṚN of the Qenya Lexicon of the 1910s of the same meaning, but with syllabic ṛ (QL/48). Its main Quenya derivative, Q. carnë, retained the same form throughout Tolkien’s life, but its Gnomish forms G. carn(in) “scarlet” and G. crintha “rosy, pink” (GL/25, 27) became N. caran “red” in the 1930s, and retained that form thereafter.
m(b)as
root. knead
mazgā
adjective. soft, pliant
mazgē
noun. dough
mazgō
noun. sticky substance, mire
skelta-
verb. to strip
tanka
adjective. firm
wed
root. bind
A root in The Etymologies of the 1930s glossed “bind” with derivatives like ᴹQ. vére/N. gwaedh “bond, troth, compact, oath” and ᴹQ. vesta-/N. gwesta- “swear”, though Tolkien deleted Quenya derivatives of this root beginning with ves- saying they fell out of use due to conflict with ᴹ√BES “wed” (Ety/WED). This root might be a later iteration of the hypothetical early root ✱ᴱ√FEDE indicated by words in the Gnomish Lexicon of the 1910s like G. fedhin “bound by agreement; ally, friend” and G. fedhra- “unite in a band” (GL/34), but the 1910s and 1930s forms are rather dissimilar so it is hard to say.
mapā
noun. hand
(n)dak
root. slay
al
prefix. without
dak
root. slay
karani
adjective. red
kiris
root. cut
kuldā
adjective. red
lin
root. sing
magā
noun. hand
māʒ
noun. hand
nay
root. lament
nāyǝ
noun. lament
ol
root. grow
rap
root. bind
rista-
verb. cut
A root in The Etymologies of the 1930s glossed “give way, make room, permit, allow”, with the derivatives in both Quenya and Noldorin having mostly to do with permission (Ety/DAB).