A noun appearing as G. molnaith “molar” in the Gnomish Lexicon of the 1910s, a combination of G. môl “mouth” and G. naith “tooth” (GL/41).

Neo-Sindarin: I would adapt this as ᴺS. molnel “molar” for purposes of Neo-Sindarin, using the later word [N.] nêl for “tooth”, and with the initial element reconceived of as [ᴺS.] mol- “grind”.