hlón noun "sound", "a noise" (VT48:29). Also hlóna. The stem of hlón is apparently hlon- if hloni "sounds" in WJ:394 is its plural form.
Quenya
lamma-
verb. ?to echo
lamma
sound
láma
noun. sound, sound; [ᴹQ.] ringing sound, echo
hlón
sound
láma#
noun. sound
sound
lamma noun "sound" (LAM)