A root in The Etymologies of the 1930s glossed “fear” (Ety/GÁYAS). One of its derivatives, N. gaer “dreadful” (< ᴹ✶gaisrā), was given a new etymology in the Quendi and Eldar essay of 1959-60, where S. gaer “awful, fearful” was derived from ✶gairā (WJ/400). However, it is conceivable that √GAYAS could have survived as an extension of the later root √GAY “astound, make aghast”.
Middle Primitive Elvish
yur
root. run
doron
root. oak
mā
noun. land
gayas
root. fear
gū
root. no, not
gū̆-
interjection. no, not
ñol-
noun. smell
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.