A noun for “embers” in The Etymologies of the 1930s derived from the root ᴹ√YUL “smoulder” and cognate to ᴹQ. yúla of the same meaning (Ety/YUL). It was marked ON. but should probably be N. as suggested by Hostetter and Wynne (EtyAC/YUL).
Conceptual Development: A form N. uilw “embers” appeared earlier in the same entry, but was deleted.
Neo-Sindarin: This word would become ✱ŷl if adapted directly to Neo-Sindarin, but the root √YUL was used for “drink” in later writings (PE17/63, 180; WJ/416). To avoid this conflict, I recommend adapting ᴹ√YUL “smoulder” as the Neo-Root ᴺ√YOL of the same meaning, which would allow the retention of this Noldorin word unchanged since it could be derived from ✱yōlā instead, where [[s|long [ō] became [ū]]] after [[s|[ju] became [ȳ]]] (probably).
The word is classed as Old Noldorin (ON) in the Etymologies, but rather seems to be Noldorin