A word appearing as G. laltha- “to dance” in the Gnomish Lexicon of the 1910s, a verb form of G. lalt “a dance” (GL/52).
Neo-Sindarin: For purposes of Neo-Sindarin, I would adapt this word as ᴺS. liltha- for better compatibility with the later root ᴹ√LILT “dance”.
A noun appearing as G. lalt “a dance” in the Gnomish Lexicon of the 1910s (GL/52), clearly based on the early root ᴱ√LḶTḶ “dance” (QL/55), probably with [[g|long syllabic [ḹ] becoming [al]]].
Neo-Sindarin: For purposes of Neo-Sindarin, I would adapt this word as ᴺS. lilt for better compatibility with the later root ᴹ√LILT “dance”, as suggested by Fiona Jallings.