sus

root. hiss

A root in The Etymologies of the 1930s glossed “hiss” with the derivative ᴹQ. surya “spirant consonant” (Ety/SUS). The root ᴹ√SIS was written nearby and was likely intended to be a variant as suggested by Carl Hostetter and Patrick Wynne (EtyAC/SIS). These two variants might be later iterations of primitive ᴱ✶sṣt- from the Early Noldorin Dictionary of the 1920s with derivatives like ᴱQ. histe- “hiss” (PE13/163).

slus

root. whisper

A root in The Etymologies of the 1930s with variants ᴹ√SLUS and ᴹ√SRUS; it was glossed “whisper” with derivatives like ᴹQ. lussa- “to whisper” and ᴹQ. lusse/N. thloss/floss “whispering sound” (Ety/SLUS). The only sign of ᴹ√SRUS was the variant form N. thross of N. thloss/floss.

srus

root. whisper

sis

root. hiss