Gnomish
beg
noun. chin
begl
noun. beard
hai
interjection. go!, hence, begone, away
haiva
interjection. hence!, begone, be off; (as av.) away, hence, off
lada-
verb. to smooth out, stroke, caress, soothe, beguile
lôda-
verb. to smooth out, stroke, caress, soothe, beguile
amaith
noun. mother
amil
noun. mother
mab(a)
noun. mother
mabir
noun. mother
nanwin
noun. mother
nosteg
adjective. birth
nân
noun. mother
A noun appearing as G. beg “chin” in the Gnomish Lexicon of the 1910s, along with a more elaborate form G. bectha “tip; chin” and (deleted) G. begl “beard” (GL/22). Tolkien connected the word G. beg “chin” to ᴱQ. pē “mouth” (GL/22) and not to ᴱQ. venta “chin” from contemporaneous the Qenya Lexicon of the 1910s under the early root ᴱ√VETE (QL/101).
Neo-Quenya: It is hard to reconcile either beg or bectha with primitive forms from later iterations of the languages, so I’d instead coin a neologism ᴺS. bened “chin” for purposes of Neo-Sindarin, cognate of ᴺQ. venta “chin” and derived from a Neo-Root ᴺ√BENET based on ᴹ√BEN “angle”.